Change panels to be able to turn off autoresize.

content/browser/renderer_host/render_view_host.cc

Index: content/browser/renderer_host/render_view_host.cc
diff --git a/content/browser/renderer_host/render_view_host.cc b/content/browser/renderer_host/render_view_host.cc
index e193dc2e71f586ccbb9a6cb3ec494e4606e7833a..4146414e9ee98d649c48f36eb3a7fe57aae42077 100644
--- a/content/browser/renderer_host/render_view_host.cc
+++ b/content/browser/renderer_host/render_view_host.cc
@@ -1091,7 +1091,7 @@ void RenderViewHost::OnMsgDidContentsPreferredSizeChange(
 }
 
 void RenderViewHost::OnRenderAutoResized(const gfx::Size& new_size) {
-  delegate_->UpdatePreferredSize(new_size);
+  delegate_->ResizeDueToAutoResize(new_size);
 }
 
 void RenderViewHost::OnMsgDidChangeScrollbarsForMainFrame(
@@ -1414,6 +1414,11 @@ void RenderViewHost::EnableAutoResize(const gfx::Size& min_size,
   Send(new ViewMsg_EnableAutoResize(routing_id(), min_size, max_size));
 }
 
+void RenderViewHost::DisableAutoResize(const gfx::Size& new_size) {
+  SetShouldAutoResize(false);
+  Send(new ViewMsg_DisableAutoResize(routing_id(), new_size));
+}
+
 void RenderViewHost::ExecuteCustomContextMenuCommand(
     int action, const content::CustomContextMenuContext& context) {
   Send(new ViewMsg_CustomContextMenuAction(routing_id(), context, action));