Revert of [blink] Unique pointers in Platform.h

content/ppapi_plugin/ppapi_blink_platform_impl.h

 // 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.
 
 #ifndef CONTENT_PPAPI_PLUGIN_PPAPI_BLINK_PLATFORM_IMPL_H_
 #define CONTENT_PPAPI_PLUGIN_PPAPI_BLINK_PLATFORM_IMPL_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 30 matching lines @@
   virtual blink::WebString cookies(
       const blink::WebURL& url,
       const blink::WebURL& first_party_for_cookies);
   blink::WebString DefaultLocale() override;
   blink::WebThemeEngine* ThemeEngine() override;
   std::unique_ptr<blink::WebURLLoader> CreateURLLoader() override;
   void GetPluginList(bool refresh,
                      const blink::WebSecurityOrigin& mainFrameOrigin,
                      blink::WebPluginListBuilder*) override;
   blink::WebData LoadResource(const char* name) override;
-  std::unique_ptr<blink::WebStorageNamespace> CreateLocalStorageNamespace()
-      override;
+  blink::WebStorageNamespace* CreateLocalStorageNamespace() override;
   virtual void dispatchStorageEvent(const blink::WebString& key,
       const blink::WebString& oldValue, const blink::WebString& newValue,
       const blink::WebString& origin, const blink::WebURL& url,
       bool isLocalStorage);
   int DatabaseDeleteFile(const blink::WebString& vfs_file_name,
                          bool sync_dir) override;
 
  private:
 #if !defined(OS_ANDROID) && !defined(OS_WIN)
   class SandboxSupport;
   std::unique_ptr<SandboxSupport> sandbox_support_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PpapiBlinkPlatformImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PPAPI_PLUGIN_PPAPI_BLINK_PLATFORM_IMPL_H_