Switch DomAutomationController to be a RenderFrameObserver.

content/common/swapped_out_messages.cc

Index: content/common/swapped_out_messages.cc
diff --git a/content/common/swapped_out_messages.cc b/content/common/swapped_out_messages.cc
index 6572ad036bcc7b716d1c86100e7b052a6a45b360..91087b44210ff92163ccf6d51a2cfbcc7b0b0b1e 100644
--- a/content/common/swapped_out_messages.cc
+++ b/content/common/swapped_out_messages.cc
@@ -29,7 +29,6 @@ bool SwappedOutMessages::CanSendWhileSwappedOut(const IPC::Message* msg) {
     case ViewHostMsg_ShouldClose_ACK::ID:
     case ViewHostMsg_SwapOut_ACK::ID:
     case ViewHostMsg_ClosePage_ACK::ID:
-    case ViewHostMsg_DomOperationResponse::ID:
     case ViewHostMsg_SwapCompositorFrame::ID:
     case ViewHostMsg_UpdateIsDelayed::ID:
     case ViewHostMsg_DidActivateAcceleratedCompositing::ID:
@@ -40,6 +39,7 @@ bool SwappedOutMessages::CanSendWhileSwappedOut(const IPC::Message* msg) {
     case FrameHostMsg_SwapOut_ACK::ID:
     // Frame detach must occur after the RenderView has swapped out.
     case FrameHostMsg_Detach::ID:
+    case FrameHostMsg_DomOperationResponse::ID:
     case FrameHostMsg_CompositorFrameSwappedACK::ID:
     case FrameHostMsg_BuffersSwappedACK::ID:
     case FrameHostMsg_ReclaimCompositorResources::ID: