content: convert zoom notifications to observer usage

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

Index: chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller_unittest.mm
diff --git a/chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller_unittest.mm b/chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller_unittest.mm
index f4f351bd813df72d67d647eae7d5ebf96092eb63..a9aa99f9922ef2268e4457cb8906d916b1d52ea9 100644
--- a/chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller_unittest.mm
+++ b/chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller_unittest.mm
@@ -44,7 +44,7 @@ class MockWrenchMenuModel : public WrenchMenuModel {
 
 class WrenchMenuControllerTest : public CocoaProfileTest {
  public:
-  virtual void SetUp() {
+  virtual void SetUp() OVERRIDE {
     CocoaProfileTest::SetUp();
     ASSERT_TRUE(browser());
 
@@ -52,6 +52,12 @@ class WrenchMenuControllerTest : public CocoaProfileTest {
     fake_model_.reset(new MockWrenchMenuModel);
   }
 
+  virtual void TearDown() OVERRIDE {
+    fake_model_.reset();
+    controller_.reset();
+    CocoaProfileTest::TearDown();
+  }
+
   WrenchMenuController* controller() {
     return controller_.get();
   }