Cleanup unused #includes and declarations in PlatformImpl

sky/viewer/platform/platform_impl.h

Index: sky/viewer/platform/platform_impl.h
diff --git a/sky/viewer/platform/platform_impl.h b/sky/viewer/platform/platform_impl.h
index 140c86fd0587916a6ffd96a4c612899c7a564fa6..5cb3c2476ccef5f679e85321c966a6fa13169694 100644
--- a/sky/viewer/platform/platform_impl.h
+++ b/sky/viewer/platform/platform_impl.h
@@ -5,10 +5,7 @@
 #ifndef SKY_VIEWER_PLATFORM_PLATFORM_IMPL_H_
 #define SKY_VIEWER_PLATFORM_PLATFORM_IMPL_H_
 
-#include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
-#include "base/threading/thread_local_storage.h"
-#include "base/timer/timer.h"
 #include "mojo/services/network/public/interfaces/network_service.mojom.h"
 #include "sky/engine/public/platform/Platform.h"
 
@@ -21,18 +18,17 @@ namespace sky {
 class PlatformImpl : public blink::Platform {
  public:
   explicit PlatformImpl(mojo::ApplicationImpl* app);
-  virtual ~PlatformImpl();
+  ~PlatformImpl() override;
 
   // blink::Platform methods:
-  virtual blink::WebString defaultLocale();
-  virtual base::SingleThreadTaskRunner* mainThreadTaskRunner();
-  virtual mojo::NetworkService* networkService();
-  virtual blink::WebURLLoader* createURLLoader();
-  virtual blink::WebURLError cancelledError(const blink::WebURL& url) const;
+  blink::WebString defaultLocale() override;
+  base::SingleThreadTaskRunner* mainThreadTaskRunner() override;
+  mojo::NetworkService* networkService() override;
+  blink::WebURLLoader* createURLLoader() override;
+  blink::WebURLError cancelledError(const blink::WebURL& url) const override;
 
  private:
   mojo::NetworkServicePtr network_service_;
-  base::MessageLoop* main_loop_;
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformImpl);