Update references to Blink's Platform API headers

cc/scheduler/rate_limiter.cc

 // Copyright 2011 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 "cc/scheduler/rate_limiter.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/base/thread.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
+#include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 
 namespace cc {
 
 scoped_refptr<RateLimiter> RateLimiter::Create(
     WebKit::WebGraphicsContext3D* context,
     RateLimiterClient* client,
     Thread* thread) {
   return make_scoped_refptr(new RateLimiter(context, client, thread));
 }
 
@@ skipping 28 matching lines @@
     return;
 
   TRACE_EVENT0("cc", "RateLimiter::RateLimitContext");
 
   active_ = false;
   client_->RateLimit();
   context_->rateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace cc