Make chrome/browser/extensions use base::Clock instead of MockTimeProvider

chrome/browser/extensions/api/alarms/alarms_api.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_API_ALARMS_ALARMS_API_H__
 #define CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARMS_API_H__
 
 #include "chrome/browser/extensions/extension_function.h"
 
+namespace base {
+class Clock;
+}  // namespace base
+
 namespace extensions {
 
 class AlarmsCreateFunction : public SyncExtensionFunction {
-  typedef base::Time (*TimeProvider)();
  public:
   AlarmsCreateFunction();
-  explicit AlarmsCreateFunction(TimeProvider now) : now_(now) {}
+  // Use |clock| instead of the default clock. Does not take ownership
+  // of |clock|. Used for testing.
+  explicit AlarmsCreateFunction(base::Clock* clock);
  protected:
-  virtual ~AlarmsCreateFunction() {}
+  virtual ~AlarmsCreateFunction();
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION("alarms.create", ALARMS_CREATE)
  private:
-  TimeProvider now_;
+  base::Clock* const clock_;
+  // Whether or not we own |clock_|. This is needed because we own it
+  // when we create it ourselves, but not when it's passed in for
+  // testing.
+  bool owns_clock_;
 };
 
 class AlarmsGetFunction : public SyncExtensionFunction {
  protected:
   virtual ~AlarmsGetFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION("alarms.get", ALARMS_GET)
 };
@@ skipping 21 matching lines @@
   virtual ~AlarmsClearAllFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION("alarms.clearAll", ALARMS_CLEARALL)
 };
 
 } //  namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARMS_API_H__