Fixed drag and drop into and out of Browser Plugin.

content/browser/web_contents/web_drag_source_gtk.cc

Index: content/browser/web_contents/web_drag_source_gtk.cc
diff --git a/content/browser/web_contents/web_drag_source_gtk.cc b/content/browser/web_contents/web_drag_source_gtk.cc
index 64e883b71e0c8224f42fa5eb2c3fb76dd8585c12..d2113b26d672d9a0cde6667acce7cf529e3bcb70 100644
--- a/content/browser/web_contents/web_drag_source_gtk.cc
+++ b/content/browser/web_contents/web_drag_source_gtk.cc
@@ -163,8 +163,8 @@ void WebDragSourceGtk::DidProcessEvent(GdkEvent* event) {
   GdkEventMotion* event_motion = reinterpret_cast<GdkEventMotion*>(event);
   gfx::Point client = ui::ClientPoint(GetContentNativeView());
 
-  if (GetRenderViewHost()) {
-    GetRenderViewHost()->DragSourceMovedTo(
+  if (web_contents_) {
+    web_contents_->DragSourceMovedTo(
         client.x(), client.y(),
         static_cast<int>(event_motion->x_root),
         static_cast<int>(event_motion->y_root));
@@ -299,8 +299,8 @@ gboolean WebDragSourceGtk::OnDragFailed(GtkWidget* sender,
   gfx::Point root = ui::ScreenPoint(GetContentNativeView());
   gfx::Point client = ui::ClientPoint(GetContentNativeView());
 
-  if (GetRenderViewHost()) {
-    GetRenderViewHost()->DragSourceEndedAt(
+  if (web_contents_) {
+    web_contents_->DragSourceEndedAt(
         client.x(), client.y(), root.x(), root.y(),
         WebDragOperationNone);
   }
@@ -371,8 +371,8 @@ void WebDragSourceGtk::OnDragEnd(GtkWidget* sender,
     gfx::Point root = ui::ScreenPoint(GetContentNativeView());
     gfx::Point client = ui::ClientPoint(GetContentNativeView());
 
-    if (GetRenderViewHost()) {
-      GetRenderViewHost()->DragSourceEndedAt(
+    if (web_contents_) {
+      web_contents_->DragSourceEndedAt(
           client.x(), client.y(), root.x(), root.y(),
           GdkDragActionToWebDragOp(drag_context->action));
     }
@@ -384,10 +384,6 @@ void WebDragSourceGtk::OnDragEnd(GtkWidget* sender,
   drag_context_ = NULL;
 }
 
-RenderViewHostImpl* WebDragSourceGtk::GetRenderViewHost() const {
-  return static_cast<RenderViewHostImpl*>(web_contents_->GetRenderViewHost());
-}
-
 gfx::NativeView WebDragSourceGtk::GetContentNativeView() const {
   return web_contents_->GetView()->GetContentNativeView();
 }