views: Remove NativeTextButton::SetLabel() and replace all call sites with SetText().

views/controls/button/checkbox.h

Index: views/controls/button/checkbox.h
diff --git a/views/controls/button/checkbox.h b/views/controls/button/checkbox.h
index e8d52b6cf4b763cd8c34bea392c464438be71669..2916c54518b37777a88d8b94c098219b5f1fc362 100644
--- a/views/controls/button/checkbox.h
+++ b/views/controls/button/checkbox.h
@@ -30,10 +30,6 @@ class VIEWS_EXPORT Checkbox : public TextButtonBase {
   virtual void SetChecked(bool checked);
   bool checked() const { return checked_; }
 
-  void SetLabel(const std::wstring& label) {
-    SetText(label);
-  }
-
  protected:
   // Overridden from View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;