Use a direct include of strings headers in chrome/browser/sync*/.

BUG=247723
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/16258008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205297 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/sync/profile_sync_service_mock.h b/chrome/browser/sync/profile_sync_service_mock.h
index e0e3fcb1..3251348 100644
--- a/chrome/browser/sync/profile_sync_service_mock.h
+++ b/chrome/browser/sync/profile_sync_service_mock.h
@@ -8,7 +8,7 @@
 #include <string>
 
 #include "base/memory/weak_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "chrome/browser/sync/glue/change_processor.h"
 #include "chrome/browser/sync/glue/data_type_controller.h"
 #include "chrome/browser/sync/profile_sync_service.h"