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

chrome/browser/ui/cocoa/location_bar/bubble_decoration.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_LOCATION_BAR_BUBBLE_DECORATION_H_
 #define CHROME_BROWSER_UI_COCOA_LOCATION_BAR_BUBBLE_DECORATION_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_nsobject.h"
 #include "chrome/browser/ui/cocoa/location_bar/location_bar_decoration.h"
 
 // Draws an outlined rounded rect, with an optional image to the left
 // and an optional text label to the right.
 
 class BubbleDecoration : public LocationBarDecoration {
  public:
   // |font| will be used when drawing the label, and cannot be |nil|.
-  BubbleDecoration(NSFont* font);
+  explicit BubbleDecoration(NSFont* font);
   virtual ~BubbleDecoration();
 
   // Setup the drawing parameters.
   NSImage* GetImage();
   void SetImage(NSImage* image);
   void SetLabel(NSString* label);
   void SetColors(NSColor* border_color,
                  NSColor* background_color,
                  NSColor* text_color);
 
@@ skipping 26 matching lines @@
 
   // Colors used to draw the bubble, should be set by the subclass
   // constructor.
   scoped_nsobject<NSColor> background_color_;
   scoped_nsobject<NSColor> border_color_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleDecoration);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_LOCATION_BAR_BUBBLE_DECORATION_H_