Add more size_t -> int warning fixes for the win x64 GN build.

media/base/BUILD.gn

Index: media/base/BUILD.gn
diff --git a/media/base/BUILD.gn b/media/base/BUILD.gn
index 0fb3b1ceca87944fc4d8eec687999c87e7598f2e..bfe41de9a595c56b8d0b08a3f9304fbc16513793 100644
--- a/media/base/BUILD.gn
+++ b/media/base/BUILD.gn
@@ -270,7 +270,10 @@ source_set("base_for_cast_ios") {
     "video_frame.cc",
     "video_frame.h",
   ]
-  configs += [ "//media:media_config" ]
+  configs += [
+    "//build/config/compiler:no_size_t_to_int_warning",
+    "//media:media_config",
+  ]
   all_dependent_configs = [ ":base_for_cast_ios_dependent_config" ]
 }
 
@@ -351,7 +354,10 @@ source_set("unittests") {
     "wall_clock_time_source_unittest.cc",
     "yuv_convert_unittest.cc",
   ]
-  configs += [ "//media:media_config" ]
+  configs += [
+    "//build/config/compiler:no_size_t_to_int_warning",
+    "//media:media_config",
+  ]
   deps = [
     ":base",
     ":test_support",