Update existing uses of /wd4267 to use the GN config

build/secondary/third_party/cacheinvalidation/BUILD.gn

Index: build/secondary/third_party/cacheinvalidation/BUILD.gn
diff --git a/build/secondary/third_party/cacheinvalidation/BUILD.gn b/build/secondary/third_party/cacheinvalidation/BUILD.gn
index 088f89a4ee3e72f0762e6c05cdd5513966981063..feb93d7467a542f7c4f7556a11e26a59839f6ada 100644
--- a/build/secondary/third_party/cacheinvalidation/BUILD.gn
+++ b/build/secondary/third_party/cacheinvalidation/BUILD.gn
@@ -77,17 +77,14 @@ static_library("cacheinvalidation") {
     "src/google/cacheinvalidation/include/types.h",
   ]
 
+  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   public_configs = [ ":cacheinvalidation_config" ]
 
   deps = [
     "src/google/cacheinvalidation:cacheinvalidation_proto_cpp",
     "//base",
   ]
-
-  if (is_win) {
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    cflags = [ "/wd4267" ]
-  }
 }
 
 test("cacheinvalidation_unittests") {