tools/src: merge the two go.mod files

These are the module dependencies.
We'll never want different versions of third_party deps, so merging these makes sense.

Change-Id: If2ff93b77ad79d31a5aad04194dcf82c9782e0d3
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/50900
Reviewed-by: David Neto <dneto@google.com>
Commit-Queue: Ben Clayton <bclayton@chromium.org>
diff --git a/tools/src/fix-tests/go.mod b/tools/src/fix-tests/go.mod
deleted file mode 100644
index b7ba1a0..0000000
--- a/tools/src/fix-tests/go.mod
+++ /dev/null
@@ -1,5 +0,0 @@
-module dawn.googlesource.com/tint/tools/src/fix-tests
-
-go 1.16
-
-require github.com/sergi/go-diff v1.2.0
diff --git a/tools/src/go.mod b/tools/src/go.mod
new file mode 100644
index 0000000..a23bdbc
--- /dev/null
+++ b/tools/src/go.mod
@@ -0,0 +1,5 @@
+module dawn.googlesource.com/tint/tools/src
+
+go 1.16
+
+require github.com/sergi/go-diff v1.2.0
diff --git a/tools/src/fix-tests/go.sum b/tools/src/go.sum
similarity index 100%
rename from tools/src/fix-tests/go.sum
rename to tools/src/go.sum
diff --git a/tools/src/trim-includes/go.mod b/tools/src/trim-includes/go.mod
deleted file mode 100644
index 294be66..0000000
--- a/tools/src/trim-includes/go.mod
+++ /dev/null
@@ -1,3 +0,0 @@
-module dawn.googlesource.com/tint/tools/src/trim-includes
-
-go 1.16