views: Mark single-argument constructors as explicit.

ui/views/controls/button/text_button.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_BUTTON_TEXT_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_TEXT_BUTTON_H_
 #pragma once
 
 #include <string>
 
@@ skipping 74 matching lines @@
 //
 // TextButtonNativeThemeBorder
 //
 //  A Border subclass that paints a TextButton's background layer using the
 //  platform's native theme look.  This handles normal/disabled/hot/pressed
 //  states, with possible animation between states.
 //
 ////////////////////////////////////////////////////////////////////////////////
 class VIEWS_EXPORT TextButtonNativeThemeBorder : public Border {
  public:
-   TextButtonNativeThemeBorder(NativeThemeDelegate* delegate);
+  explicit TextButtonNativeThemeBorder(NativeThemeDelegate* delegate);
   virtual ~TextButtonNativeThemeBorder();
 
   // Implementation of Border:
   virtual void Paint(const View& view, gfx::Canvas* canvas) const OVERRIDE;
   virtual void GetInsets(gfx::Insets* insets) const OVERRIDE;
 
  private:
   // The delegate the controls the appearance of this border.
   NativeThemeDelegate* delegate_;
 
@@ skipping 286 matching lines @@
 //
 //  A TextButton that uses the NativeTheme border and sets some properties,
 //  like ignore-minimize-size and text alignment minimum size.
 //
 ////////////////////////////////////////////////////////////////////////////////
 class VIEWS_EXPORT NativeTextButton : public TextButton {
  public:
   // The button's class name.
   static const char kViewClassName[];
 
-  NativeTextButton(ButtonListener* listener);
+  explicit NativeTextButton(ButtonListener* listener);
   NativeTextButton(ButtonListener* listener, const string16& text);
 
   // Overridden from TextButton:
   virtual gfx::Size GetMinimumSize() OVERRIDE;
-
   virtual std::string GetClassName() const OVERRIDE;
 
  private:
   void Init();
 
   // Overridden from View:
   virtual void OnPaintFocusBorder(gfx::Canvas* canvas) OVERRIDE;
 
   // Overridden from TextButton:
   virtual void GetExtraParams(
       gfx::NativeTheme::ExtraParams* params) const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(NativeTextButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_TEXT_BUTTON_H_