Move GPUFeatureChecker to content layer

chrome/browser/extensions/chrome_requirements_checker.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 CHROME_BROWSER_EXTENSIONS_CHROME_REQUIREMENTS_CHECKER_H_
 #define CHROME_BROWSER_EXTENSIONS_CHROME_REQUIREMENTS_CHECKER_H_
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "extensions/browser/requirements_checker.h"
 
-class GPUFeatureChecker;
+namespace content {
+class GpuFeatureChecker;
+}
 
 namespace extensions {
 class Extension;
 
 // Validates the 'requirements' extension manifest field. This is an
 // asynchronous process that involves several threads, but the public interface
 // of this class (including constructor and destructor) must only be used on
 // the UI thread.
 class ChromeRequirementsChecker : public RequirementsChecker {
  public:
   ChromeRequirementsChecker();
   ~ChromeRequirementsChecker() override;
 
  private:
   // RequirementsChecker:
   void Check(const scoped_refptr<const Extension>& extension,
              const RequirementsCheckedCallback& callback) override;
 
-  // Callbacks for the GPUFeatureChecker.
+  // Callbacks for the GpuFeatureChecker.
   void SetWebGLAvailability(bool available);
 
   void MaybeRunCallback();
 
   std::vector<std::string> errors_;
 
   // Every requirement that needs to be resolved asynchronously will add to
   // this counter. When the counter is depleted, the callback will be run.
   int pending_requirement_checks_;
 
-  scoped_refptr<GPUFeatureChecker> webgl_checker_;
+  scoped_refptr<content::GpuFeatureChecker> webgl_checker_;
 
   RequirementsCheckedCallback callback_;
 
   base::WeakPtrFactory<ChromeRequirementsChecker> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRequirementsChecker);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CHROME_REQUIREMENTS_CHECKER_H_