Move the rest of extension_manifest_constants to top-level extensions/

chrome/common/extensions/api/extension_action/page_action_manifest_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/extensions/api/extension_action/action_info.h"
 #include "chrome/common/extensions/extension.h"
-#include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/manifest_tests/extension_manifest_test.h"
 #include "extensions/common/error_utils.h"
+#include "extensions/common/manifest_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-namespace errors = extension_manifest_errors;
-namespace keys = extensions::manifest_keys;
+namespace extensions {
 
-namespace extensions {
+namespace errors = manifest_errors;
+namespace keys = manifest_keys;
 
 class PageActionManifestTest : public ExtensionManifestTest {
  protected:
   virtual const char* test_data_dir() OVERRIDE {
     return "page_action";
   }
 
   scoped_ptr<ActionInfo> LoadAction(const std::string& manifest_filename);
 };
 
@@ skipping 131 matching lines @@
   action = LoadAction("page_action_empty_popup.json");
 
   ASSERT_TRUE(action);
   EXPECT_TRUE(action->default_popup_url.is_empty());
   ASSERT_STREQ(
       "",
       action->default_popup_url.spec().c_str());
 }
 
 }  // namespace extensions