fix missing deps in dxcompiler_sources

This is to fix build failure like http://b/367521378#comment2.

Bug: b/367521378
Change-Id: I1f961c1edd0adb6b59446549b78705088cd9ea6c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/206834
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
Auto-Submit: Takuto Ikuta <tikuta@google.com>
diff --git a/third_party/gn/dxc/BUILD.gn b/third_party/gn/dxc/BUILD.gn
index 4cd30d1..4ae3d74 100644
--- a/third_party/gn/dxc/BUILD.gn
+++ b/third_party/gn/dxc/BUILD.gn
@@ -2298,6 +2298,7 @@
     "$dawn_dxc_dir/tools/clang/tools/dxcompiler/dxcvalidator.cpp",
     "$dawn_dxc_dir/tools/clang/tools/dxcompiler/dxillib.cpp",
   ]
+  deps = [ ":DxcDisassembler-inc" ]
 }
 
 dxcompiler_sourceset("dxcvalidator_lib") {