Remove TRACE_EVENT indirection through blink::Platform

sky/engine/testing/platform/platform_impl.cc

 // Copyright 2014 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 "sky/engine/testing/platform/platform_impl.h"
 
 #include <cmath>
 
 #include "base/rand_util.h"
 #include "base/stl_util.h"
@@ skipping 64 matching lines @@
 }
 
 void PlatformImpl::stopSharedTimer() {
   shared_timer_.Stop();
 }
 
 blink::WebUnitTestSupport* PlatformImpl::unitTestSupport() {
   return &unit_test_support_;
 }
 
-const unsigned char* PlatformImpl::getTraceCategoryEnabledFlag(
-    const char* category_name) {
-  static const unsigned char buf[] = "*";
-  return buf;
-}
-
 }  // namespace sky