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

chrome/browser/ui/cocoa/global_error_bubble_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/global_error_bubble_controller.h"
 
 #include "base/logging.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/search_engines/util.h"
@@ skipping 18 matching lines @@
 // The vertical offset of the wrench bubble from the wrench menu button.
 const CGFloat kWrenchBubblePointOffsetY = 6;
 
 } // namespace
 
 namespace GlobalErrorBubbleControllerInternal {
 
 // This is the bridge to the C++ GlobalErrorBubbleViewBase object.
 class Bridge : public GlobalErrorBubbleViewBase {
  public:
-  Bridge(GlobalErrorBubbleController* controller) : controller_(controller) {
+  explicit Bridge(GlobalErrorBubbleController* controller)
+      : controller_(controller) {
   }
 
  private:
   virtual void CloseBubbleView() OVERRIDE {
     [controller_ close];
   }
 
   GlobalErrorBubbleController* controller_;  // Weak, owns this.
 };
 
@@ skipping 92 matching lines @@
   [self close];
 }
 
 @end
 
 GlobalErrorBubbleViewBase* GlobalErrorBubbleViewBase::ShowBubbleView(
     Browser* browser,
     const base::WeakPtr<GlobalError>& error) {
   return [GlobalErrorBubbleController showForBrowser:browser error:error];
 }