Remove a bunch of TOOLKIT_GTK in content/ and gpu/, as well as NPAPI plugins on linux

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 14e52b24f232e12abcef4714e7971aab3599852c..19b1986bcb90e9deea1cf30d0b7728ed7e482769 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -301,16 +301,6 @@ void RenderWidgetHostViewChildFrame::ShowDisambiguationPopup(
 }
 #endif  // defined(OS_ANDROID)
 
-#if defined(TOOLKIT_GTK)
-GdkEventButton* RenderWidgetHostViewChildFrame::GetLastMouseDown() {
-  return NULL;
-}
-
-gfx::NativeView RenderWidgetHostViewChildFrame::BuildInputMethodsGtkMenu() {
-  return NULL;
-}
-#endif  // defined(TOOLKIT_GTK)
-
 BackingStore* RenderWidgetHostViewChildFrame::AllocBackingStore(
     const gfx::Size& size) {
   NOTREACHED();