Remove SW rendering path code from BrowserPlugin.

content/browser/frame_host/render_widget_host_view_guest.cc

Index: content/browser/frame_host/render_widget_host_view_guest.cc
diff --git a/content/browser/frame_host/render_widget_host_view_guest.cc b/content/browser/frame_host/render_widget_host_view_guest.cc
index c564a282faf1ba75e4fa1c4396ec09666219e4fe..fe71f124a6c10575c878523f47ea8762873b34bb 100644
--- a/content/browser/frame_host/render_widget_host_view_guest.cc
+++ b/content/browser/frame_host/render_widget_host_view_guest.cc
@@ -167,9 +167,6 @@ void RenderWidgetHostViewGuest::AcceleratedSurfaceBuffersSwapped(
   if (!guest_)
     return;
 
-  // If accelerated surface buffers are getting swapped then we're not using
-  // the software path.
-  guest_->clear_damage_buffer();
   FrameMsg_BuffersSwapped_Params guest_params;
   guest_params.size = params.size;
   guest_params.mailbox = params.mailbox;
@@ -192,8 +189,6 @@ void RenderWidgetHostViewGuest::OnSwapCompositorFrame(
   if (!guest_)
     return;
 
-  guest_->clear_damage_buffer();
-
   if (!guest_->attached()) {
     // If the guest doesn't have an embedder then there's nothing to give the
     // the frame to.