diff --git a/scripts/dawn_component.gni b/scripts/dawn_component.gni
index 5fcc15a..2c9e1d4 100644
--- a/scripts/dawn_component.gni
+++ b/scripts/dawn_component.gni
@@ -90,16 +90,10 @@
     }
 
     # If a "build with ARC" config is present, remove it.
-    # TODO(https://crbug.com/1280317): Remove the "enable_arc2" variant
-    # when ARC migration in the Chromium repo is complete.
     if (filter_include(configs, [ "//build/config/compiler:enable_arc" ]) !=
         []) {
       configs -= [ "//build/config/compiler:enable_arc" ]
     }
-    if (filter_include(configs, [ "//build/config/compiler:enable_arc2" ]) !=
-        []) {
-      configs -= [ "//build/config/compiler:enable_arc2" ]
-    }
 
     # Tell dependents where to find this shared library
     if (is_mac) {
@@ -142,16 +136,10 @@
     }
 
     # If a "build with ARC" config is present, remove it.
-    # TODO(https://crbug.com/1280317): Remove the "enable_arc2" variant
-    # when ARC migration in the Chromium repo is complete.
     if (filter_include(configs, [ "//build/config/compiler:enable_arc" ]) !=
         []) {
       configs -= [ "//build/config/compiler:enable_arc" ]
     }
-    if (filter_include(configs, [ "//build/config/compiler:enable_arc2" ]) !=
-        []) {
-      configs -= [ "//build/config/compiler:enable_arc2" ]
-    }
   }
 
   group(name) {
diff --git a/src/dawn/glfw/BUILD.gn b/src/dawn/glfw/BUILD.gn
index 1bc788c..dd4d360 100644
--- a/src/dawn/glfw/BUILD.gn
+++ b/src/dawn/glfw/BUILD.gn
@@ -40,16 +40,10 @@
       ]
 
       # If a "build with ARC" config is present, remove it.
-      # TODO(https://crbug.com/1280317): Remove the "enable_arc2" variant
-      # when ARC migration in the Chromium repo is complete.
       if (filter_include(configs, [ "//build/config/compiler:enable_arc" ]) !=
           []) {
         configs -= [ "//build/config/compiler:enable_arc" ]
       }
-      if (filter_include(configs, [ "//build/config/compiler:enable_arc2" ]) !=
-          []) {
-        configs -= [ "//build/config/compiler:enable_arc2" ]
-      }
     }
 
     public_deps = [
diff --git a/src/dawn/native/BUILD.gn b/src/dawn/native/BUILD.gn
index 1a5d683..2f80783 100644
--- a/src/dawn/native/BUILD.gn
+++ b/src/dawn/native/BUILD.gn
@@ -616,16 +616,10 @@
     ]
 
     # If a "build with ARC" config is present, remove it.
-    # TODO(https://crbug.com/1280317): Remove the "enable_arc2" variant
-    # when ARC migration in the Chromium repo is complete.
     if (filter_include(configs, [ "//build/config/compiler:enable_arc" ]) !=
         []) {
       configs -= [ "//build/config/compiler:enable_arc" ]
     }
-    if (filter_include(configs, [ "//build/config/compiler:enable_arc2" ]) !=
-        []) {
-      configs -= [ "//build/config/compiler:enable_arc2" ]
-    }
   }
 
   if (dawn_enable_null) {
diff --git a/src/dawn/tests/BUILD.gn b/src/dawn/tests/BUILD.gn
index fca9fc3..df65dfd 100644
--- a/src/dawn/tests/BUILD.gn
+++ b/src/dawn/tests/BUILD.gn
@@ -701,16 +701,10 @@
     ]
 
     # If a "build with ARC" config is present, remove it.
-    # TODO(https://crbug.com/1280317): Remove the "enable_arc2" variant
-    # when ARC migration in the Chromium repo is complete.
     if (filter_include(configs, [ "//build/config/compiler:enable_arc" ]) !=
         []) {
       configs -= [ "//build/config/compiler:enable_arc" ]
     }
-    if (filter_include(configs, [ "//build/config/compiler:enable_arc2" ]) !=
-        []) {
-      configs -= [ "//build/config/compiler:enable_arc2" ]
-    }
   }
 
   if (dawn_enable_opengles) {
diff --git a/src/dawn/utils/BUILD.gn b/src/dawn/utils/BUILD.gn
index 5c28981..f71d109 100644
--- a/src/dawn/utils/BUILD.gn
+++ b/src/dawn/utils/BUILD.gn
@@ -76,16 +76,10 @@
     frameworks += [ "QuartzCore.framework" ]
 
     # If a "build with ARC" config is present, remove it.
-    # TODO(https://crbug.com/1280317): Remove the "enable_arc2" variant
-    # when ARC migration in the Chromium repo is complete.
     if (filter_include(configs, [ "//build/config/compiler:enable_arc" ]) !=
         []) {
       configs -= [ "//build/config/compiler:enable_arc" ]
     }
-    if (filter_include(configs, [ "//build/config/compiler:enable_arc2" ]) !=
-        []) {
-      configs -= [ "//build/config/compiler:enable_arc2" ]
-    }
   } else {
     sources += [ "PosixTimer.cpp" ]
   }
diff --git a/third_party/gn/glfw/BUILD.gn b/third_party/gn/glfw/BUILD.gn
index e45f65d..bfc1f97 100644
--- a/third_party/gn/glfw/BUILD.gn
+++ b/third_party/gn/glfw/BUILD.gn
@@ -158,16 +158,10 @@
     ]
 
     # If a "build with ARC" config is present, remove it.
-    # TODO(https://crbug.com/1280317): Remove the "enable_arc2" variant
-    # when ARC migration in the Chromium repo is complete.
     if (filter_include(configs, [ "//build/config/compiler:enable_arc" ]) !=
         []) {
       configs -= [ "//build/config/compiler:enable_arc" ]
     }
-    if (filter_include(configs, [ "//build/config/compiler:enable_arc2" ]) !=
-        []) {
-      configs -= [ "//build/config/compiler:enable_arc2" ]
-    }
 
     frameworks = [
       "Cocoa.framework",