Add missing (and remove superfluous) 'explicit' from constructors.

content/renderer/gpu/gpu_benchmarking_extension.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 "content/renderer/gpu/gpu_benchmarking_extension.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/file_path.h"
@@ skipping 66 matching lines @@
   }
 
  private:
   FilePath dirpath_;
   int layer_id_;
   SkPicture picture_;
 };
 
 class RenderingStatsEnumerator : public cc::RenderingStats::Enumerator {
  public:
-  RenderingStatsEnumerator(v8::Handle<v8::Object> stats_object)
+  explicit RenderingStatsEnumerator(v8::Handle<v8::Object> stats_object)
       : stats_object(stats_object) { }
 
   virtual void AddInt64(const char* name, int64 value) {
     stats_object->Set(v8::String::New(name), v8::Number::New(value));
   }
 
   virtual void AddDouble(const char* name, double value) {
     stats_object->Set(v8::String::New(name), v8::Number::New(value));
   }
 
@@ skipping 345 matching lines @@
 
     return v8::Undefined();
   }
 };
 
 v8::Extension* GpuBenchmarkingExtension::Get() {
   return new GpuBenchmarkingWrapper();
 }
 
 }  // namespace content