Create extensions_test_support build target

chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk_unittest.cc

Index: chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk_unittest.cc
diff --git a/chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk_unittest.cc b/chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk_unittest.cc
index 7e8b8bc9db8afba7622b8f54779aa283c3fa8b12..7a644170b2c8bf700a3f267fed1ae60e3c23bfac 100644
--- a/chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk_unittest.cc
+++ b/chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk_unittest.cc
@@ -7,8 +7,8 @@
 #include "chrome/browser/media_galleries/media_galleries_dialog_controller_mock.h"
 #include "chrome/browser/storage_monitor/storage_info.h"
 #include "chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.h"
-#include "chrome/common/extensions/extension_test_util.h"
 #include "extensions/common/extension.h"
+#include "extensions/common/test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
@@ -35,7 +35,7 @@ class MediaGalleriesDialogTest : public testing::Test {
   MediaGalleriesDialogTest() {}
   virtual ~MediaGalleriesDialogTest() {}
   virtual void SetUp() OVERRIDE {
-    dummy_extension_ = extension_test_util::CreateExtensionWithID("dummy");
+    dummy_extension_ = extensions::test_util::CreateExtensionWithID("dummy");
   }
   virtual void TearDown() OVERRIDE {
     dummy_extension_ = NULL;