Revise a stale comment on ignore_result()

BUG=n/a

Review URL: https://codereview.chromium.org/1222103004

Cr-Commit-Position: refs/heads/master@{#337293}
diff --git a/base/compiler_specific.h b/base/compiler_specific.h
index 63297dca..66dc80d 100644
--- a/base/compiler_specific.h
+++ b/base/compiler_specific.h
@@ -140,7 +140,7 @@
 // Annotate a function indicating the caller must examine the return value.
 // Use like:
 //   int foo() WARN_UNUSED_RESULT;
-// To explicitly ignore a result, see |ignore_result()| in <base/basictypes.h>.
+// To explicitly ignore a result, see |ignore_result()| in base/macros.h.
 #if defined(COMPILER_GCC)
 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else