Add missing (and remove superfluous) 'explicit' from constructors.

chrome/browser/ui/cocoa/profile_menu_controller.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.
 
 #import "chrome/browser/ui/cocoa/profile_menu_controller.h"
 
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/avatar_menu_model.h"
 #include "chrome/browser/profiles/avatar_menu_model_observer.h"
@@ skipping 13 matching lines @@
 
 @interface ProfileMenuController (Private)
 - (void)initializeMenu;
 @end
 
 namespace ProfileMenuControllerInternal {
 
 class Observer : public chrome::BrowserListObserver,
                  public AvatarMenuModelObserver {
  public:
-  Observer(ProfileMenuController* controller) : controller_(controller) {
+  explicit Observer(ProfileMenuController* controller)
+      : controller_(controller) {
     BrowserList::AddObserver(this);
   }
 
   ~Observer() {
     BrowserList::RemoveObserver(this);
   }
 
   // chrome::BrowserListObserver:
   virtual void OnBrowserAdded(Browser* browser) {}
   virtual void OnBrowserRemoved(Browser* browser) {
@@ skipping 169 matching lines @@
 }
 
 - (NSMenuItem*)createItemWithTitle:(NSString*)title action:(SEL)sel {
   scoped_nsobject<NSMenuItem> item(
       [[NSMenuItem alloc] initWithTitle:title action:sel keyEquivalent:@""]);
   [item setTarget:self];
   return [item.release() autorelease];
 }
 
 @end