content: convert zoom notifications to observer usage

chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller_unittest.mm

 // 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 "base/memory/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/sync/glue/session_model_associator.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
@@ skipping 26 matching lines @@
     // seems that the vector of observers is getting hosed somewhere between
     // |-[ToolbarController dealloc]| and ~MockWrenchMenuModel(). This line
     // short-circuits the parent destructor to avoid this crash.
     tab_strip_model_ = NULL;
   }
   MOCK_METHOD1(ExecuteCommand, void(int command_id));
 };
 
 class WrenchMenuControllerTest : public CocoaProfileTest {
  public:
-  virtual void SetUp() {
+  virtual void SetUp() OVERRIDE {
     CocoaProfileTest::SetUp();
     ASSERT_TRUE(browser());
 
     controller_.reset([[WrenchMenuController alloc] initWithBrowser:browser()]);
     fake_model_.reset(new MockWrenchMenuModel);
   }
 
+  virtual void TearDown() OVERRIDE {
+    fake_model_.reset();
+    controller_.reset();
+    CocoaProfileTest::TearDown();
+  }
+
   WrenchMenuController* controller() {
     return controller_.get();
   }
 
   scoped_nsobject<WrenchMenuController> controller_;
 
   scoped_ptr<MockWrenchMenuModel> fake_model_;
 };
 
 TEST_F(WrenchMenuControllerTest, Initialized) {
@@ skipping 119 matching lines @@
 
 // Verify that |RecentTabsMenuModelDelegate| is deleted before the model
 // it's observing.
 TEST_F(WrenchMenuControllerTest, RecentTabDeleteOrder) {
   chrome::search::EnableInstantExtendedAPIForTesting();
   [controller_ menuNeedsUpdate:[controller_ menu]];
   // If the delete order is wrong then the test will crash on exit.
 }
 
 }  // namespace