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

issue somewhere (I'm sure).

R=sky@chromium.org
BUG=224259


Review URL: https://chromiumcodereview.appspot.com/13533021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192667 0039d316-1c4b-4281-b951-d872f2087c98

ui/views/controls/button/checkbox.h

@@ -18,7 +18,8 @@ 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