Remove notifications from the sad tab helper.

chrome/browser/ui/sad_tab_helper.cc

Index: chrome/browser/ui/sad_tab_helper.cc
diff --git a/chrome/browser/ui/sad_tab_helper.cc b/chrome/browser/ui/sad_tab_helper.cc
index dfcb1cfcb00280869a0ee42024afdb2c53d5d027..8ad27ece6ab4acc5cd3fcd8e29f05fc607a56468 100644
--- a/chrome/browser/ui/sad_tab_helper.cc
+++ b/chrome/browser/ui/sad_tab_helper.cc
@@ -7,8 +7,6 @@
 #include "base/logging.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/ui/sad_tab.h"
-#include "content/public/browser/notification_source.h"
-#include "content/public/browser/notification_types.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 
@@ -19,8 +17,13 @@ SadTabHelper::~SadTabHelper() {
 
 SadTabHelper::SadTabHelper(content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents) {
-  registrar_.Add(this, content::NOTIFICATION_WEB_CONTENTS_CONNECTED,
-                 content::Source<content::WebContents>(web_contents));
+}
+
+void SadTabHelper::RenderViewReady() {
+  if (sad_tab_) {
+    sad_tab_->Close();
+    sad_tab_.reset();
+  }
 }
 
 void SadTabHelper::RenderProcessGone(base::TerminationStatus status) {
@@ -37,16 +40,6 @@ void SadTabHelper::RenderProcessGone(base::TerminationStatus status) {
     InstallSadTab(status);
 }
 
-void SadTabHelper::Observe(int type,
-                           const content::NotificationSource& source,
-                           const content::NotificationDetails& details) {
-  DCHECK_EQ(content::NOTIFICATION_WEB_CONTENTS_CONNECTED, type);
-  if (sad_tab_) {
-    sad_tab_->Close();
-    sad_tab_.reset();
-  }
-}
-
 void SadTabHelper::InstallSadTab(base::TerminationStatus status) {
   chrome::SadTabKind kind =
       (status == base::TERMINATION_STATUS_PROCESS_WAS_KILLED) ?