Separate the building files for gtest and gmock.

This splits testing/BUILD.gn into testing/gtest/BUILD.gn and testing/gmock/BUILD.gn, making it more modular and fixes the Brett's TODOs in testing/BUILD.gn

BUG=None
TEST=gn, ninja -C out/Default
[email protected]

Review URL: https://codereview.chromium.org/109093006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242756 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/tools/gn/secondary/url/BUILD.gn b/tools/gn/secondary/url/BUILD.gn
index 4a8223c..f455947c 100644
--- a/tools/gn/secondary/url/BUILD.gn
+++ b/tools/gn/secondary/url/BUILD.gn
@@ -64,7 +64,7 @@
     ":url",
     "//base:base_i18n",
     "//base/test:run_all_unittests",
-    "//testing:gtest",
+    "//testing/gtest",
     "//third_party/icu:icuuc",
   ]
 }