Use a direct include of strings headers in extensions/, google_apis/, gpu/.

BUG=247723
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/16632010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205460 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/extensions/common/matcher/url_matcher_unittest.cc b/extensions/common/matcher/url_matcher_unittest.cc
index 7ccc058f..15a41a16 100644
--- a/extensions/common/matcher/url_matcher_unittest.cc
+++ b/extensions/common/matcher/url_matcher_unittest.cc
@@ -4,7 +4,7 @@
 
 #include "extensions/common/matcher/url_matcher.h"
 
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"