Move dispatching and sending of the last extension specific messages out of TabContents and Rende...

content/browser/tab_contents/tab_contents_observer.cc

Index: content/browser/tab_contents/tab_contents_observer.cc
===================================================================
--- content/browser/tab_contents/tab_contents_observer.cc	(revision 80315)
+++ content/browser/tab_contents/tab_contents_observer.cc	(working copy)
@@ -7,6 +7,23 @@
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/tab_contents/tab_contents.h"
 
+TabContentsObserver::Registrar::Registrar(TabContentsObserver* observer)
+    : observer_(observer), tab_(NULL) {
+}
+
+TabContentsObserver::Registrar::~Registrar() {
+  if (tab_)
+    tab_->RemoveObserver(observer_);
+}
+
+void TabContentsObserver::Registrar::Observe(TabContents* tab) {
+  if (tab_)
+    tab_->RemoveObserver(observer_);
+  tab_ = tab;
+  if (tab_)
+    tab_->AddObserver(observer_);
+}
+
 void TabContentsObserver::NavigateToPendingEntry() {
 }
 
@@ -41,6 +58,10 @@
   tab_contents_->AddObserver(this);
 }
 
+TabContentsObserver::TabContentsObserver()
+    : tab_contents_(NULL), routing_id_(MSG_ROUTING_NONE) {
+}
+
 TabContentsObserver::~TabContentsObserver() {
   if (tab_contents_)
     tab_contents_->RemoveObserver(this);