Revert of Remove the RenderProcessHost observer and attach the WebContentsObserver earlier to the GuestView.

extensions/browser/guest_view/guest_view_base.h

Index: extensions/browser/guest_view/guest_view_base.h
diff --git a/extensions/browser/guest_view/guest_view_base.h b/extensions/browser/guest_view/guest_view_base.h
index d00906179f87837f5566a2016be9e99733f7c813..b881309d16b034d0f9b3e0d86a0f3cba089fbcb7 100644
--- a/extensions/browser/guest_view/guest_view_base.h
+++ b/extensions/browser/guest_view/guest_view_base.h
@@ -27,6 +27,7 @@
 // WebContents. At that point, its lifetime is restricted in scope to the
 // lifetime of its embedder WebContents.
 class GuestViewBase : public content::BrowserPluginGuestDelegate,
+                      public content::RenderProcessHostObserver,
                       public content::WebContentsDelegate,
                       public content::WebContentsObserver {
  public:
@@ -170,9 +171,10 @@
             const base::DictionaryValue& create_params,
             const WebContentsCreatedCallback& callback);
 
-  void InitWithWebContents(const std::string& embedder_extension_id,
-                           content::WebContents* embedder_web_contents,
-                           content::WebContents* guest_web_contents);
+  void InitWithWebContents(
+      const std::string& embedder_extension_id,
+      int embedder_render_process_id,
+      content::WebContents* guest_web_contents);
 
   bool IsViewType(const char* const view_type) const {
     return !strcmp(GetViewType(), view_type);
@@ -226,6 +228,12 @@
   // Saves the attach state of the custom element hosting this GuestView.
   void SetAttachParams(const base::DictionaryValue& params);
   void SetOpener(GuestViewBase* opener);
+
+  // RenderProcessHostObserver implementation
+  virtual void RenderProcessExited(content::RenderProcessHost* host,
+                                   base::ProcessHandle handle,
+                                   base::TerminationStatus status,
+                                   int exit_code) override;
 
   // BrowserPluginGuestDelegate implementation.
   virtual void DidAttach(int guest_proxy_routing_id) override final;
@@ -249,12 +257,12 @@
   virtual ~GuestViewBase();
 
  private:
-  class EmbedderLifetimeObserver;
+  class EmbedderWebContentsObserver;
 
   void SendQueuedEvents();
 
   void CompleteInit(const std::string& embedder_extension_id,
-                    content::WebContents* embedder_web_contents,
+                    int embedder_render_process_id,
                     const WebContentsCreatedCallback& callback,
                     content::WebContents* guest_web_contents);
 
@@ -312,7 +320,7 @@
   // guests that are created from this guest.
   scoped_ptr<base::DictionaryValue> attach_params_;
 
-  scoped_ptr<EmbedderLifetimeObserver> embedder_web_contents_observer_;
+  scoped_ptr<EmbedderWebContentsObserver> embedder_web_contents_observer_;
 
   // The size of the container element.
   gfx::Size element_size_;