PlatformEnableUIControl  212 content/shell/browser/shell.cc   PlatformEnableUIControl(BACK_BUTTON, current_index > 0);
PlatformEnableUIControl  213 content/shell/browser/shell.cc   PlatformEnableUIControl(FORWARD_BUTTON, current_index < max_index);
PlatformEnableUIControl  214 content/shell/browser/shell.cc   PlatformEnableUIControl(STOP_BUTTON,
PlatformEnableUIControl  193 content/shell/browser/shell.h   void PlatformEnableUIControl(UIControl control, bool is_enabled);