Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/apps/app_shim/extension_app_shim_handler_mac_unittest.cc

 // Copyright 2013 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 "chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h"
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/apps/app_shim/app_shim_host_mac.h"
@@ skipping 98 matching lines @@
   FakeHost(const base::FilePath& profile_path,
            const std::string& app_id,
            TestingExtensionAppShimHandler* handler)
       : profile_path_(profile_path),
         app_id_(app_id),
         handler_(handler),
         close_count_(0) {}
 
   MOCK_METHOD1(OnAppLaunchComplete, void(AppShimLaunchResult));
 
-  virtual void OnAppClosed() override {
+  void OnAppClosed() override {
     handler_->OnShimClose(this);
     ++close_count_;
   }
-  virtual void OnAppHide() override {}
-  virtual void OnAppRequestUserAttention(AppShimAttentionType type) override {}
-  virtual base::FilePath GetProfilePath() const override {
+  void OnAppHide() override {}
+  void OnAppRequestUserAttention(AppShimAttentionType type) override {}
+  base::FilePath GetProfilePath() const override {
     return profile_path_;
   }
-  virtual std::string GetAppId() const override { return app_id_; }
+  std::string GetAppId() const override { return app_id_; }
 
   int close_count() { return close_count_; }
 
  private:
   base::FilePath profile_path_;
   std::string app_id_;
   TestingExtensionAppShimHandler* handler_;
   int close_count_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeHost);
@@ skipping 248 matching lines @@
       .WillRepeatedly(Return(&profile_a_));
   EXPECT_CALL(*delegate_, LoadProfileAsync(profile_path_a_, _))
       .WillOnce(Invoke(delegate_, &MockDelegate::CaptureLoadProfileCallback));
   NormalLaunch(&host_aa_);
   EXPECT_FALSE(handler_->FindHost(&profile_a_, kTestAppIdA));
   delegate_->RunLoadProfileCallback(profile_path_a_, &profile_a_);
   EXPECT_TRUE(handler_->FindHost(&profile_a_, kTestAppIdA));
 }
 
 }  // namespace apps