Fix uninitialized POD member |use_custom_insets_| to fix regression and coverity

ui/views/controls/button/checkbox.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_CHECKBOX_H_
 #define UI_VIEWS_CONTROLS_BUTTON_CHECKBOX_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/string16.h"
 #include "ui/views/controls/button/text_button.h"
 
 namespace views {
 
 // A border with zero left inset.
 class VIEWS_EXPORT CheckboxNativeThemeBorder
     : public TextButtonNativeThemeBorder {
  public:
   explicit CheckboxNativeThemeBorder(views::NativeThemeDelegate* delegate)
-      : TextButtonNativeThemeBorder(delegate) {}
+      : TextButtonNativeThemeBorder(delegate),
+        use_custom_insets_(false) {}
   virtual ~CheckboxNativeThemeBorder() {}
 
   // The insets apply to the whole view (checkbox + text), not just the square
   // with the checkmark in it. The insets do not visibly affect the checkbox,
   // except to ensure that there is enough padding between this and other
   // elements.
   virtual gfx::Insets GetInsets() const OVERRIDE;
 
   // Use the |custom_insets_| provided instead of those from the theme.
   void SetCustomInsets(const gfx::Insets& custom_insets);
@@ skipping 48 matching lines @@
 
   // True if the checkbox is checked.
   bool checked_;
 
   DISALLOW_COPY_AND_ASSIGN(Checkbox);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_CHECKBOX_H_