Coverity: Fix a few pass-by-values.

content/browser/gpu/gpu_data_manager_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_BROWSER_GPU_GPU_DATA_MANAGER_IMPL_H_
 #define CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_IMPL_H_
 #pragma once
 
 #include <set>
 #include <string>
 
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/synchronization/lock.h"
 #include "base/values.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/common/gpu_info.h"
 
 class CommandLine;
 
 class CONTENT_EXPORT GpuDataManagerImpl
     : public NON_EXPORTED_BASE(content::GpuDataManager) {
  public:
   // Getter for the singleton. This will return NULL on failure.
   static GpuDataManagerImpl* GetInstance();
 
-  // GpuDataManager implementation:
+  // GpuDataManager implementation.
   virtual content::GpuFeatureType GetGpuFeatureType() OVERRIDE;
   virtual void SetGpuFeatureType(content::GpuFeatureType feature_type) OVERRIDE;
   virtual content::GPUInfo GetGPUInfo() const OVERRIDE;
   virtual bool GpuAccessAllowed() OVERRIDE;
   virtual void RequestCompleteGpuInfoIfNeeded() OVERRIDE;
   virtual bool IsCompleteGPUInfoAvailable() const OVERRIDE;
   virtual bool ShouldUseSoftwareRendering() OVERRIDE;
-  virtual void RegisterSwiftShaderPath(FilePath path) OVERRIDE;
+  virtual void RegisterSwiftShaderPath(const FilePath& path) OVERRIDE;
   virtual const base::ListValue& GetLogMessages() const OVERRIDE;
   virtual void AddObserver(content::GpuDataManagerObserver* observer) OVERRIDE;
   virtual void RemoveObserver(
       content::GpuDataManagerObserver* observer) OVERRIDE;
 
   // Only update if the current GPUInfo is not finalized.
   void UpdateGpuInfo(const content::GPUInfo& gpu_info);
 
   void AddLogMessage(Value* msg);
 
   // Inserting disable-feature switches into renderer process command-line
-  // in correspondance to preliminary gpu feature flags.
+  // in correspondence to preliminary gpu feature flags.
   void AppendRendererCommandLine(CommandLine* command_line);
 
   // Inserting switches into gpu process command-line: kUseGL,
   // kDisableGLMultisampling.
   void AppendGpuCommandLine(CommandLine* command_line);
 
   // This gets called when switching GPU might have happened.
   void HandleGpuSwitch();
 
   // Force the current card to be blacklisted (usually due to GPU process
@@ skipping 50 matching lines @@
 
   FilePath swiftshader_path_;
 
   // Current card force-blacklisted due to GPU crashes.
   bool card_blacklisted_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuDataManagerImpl);
 };
 
 #endif  // CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_IMPL_H_