Move allocate instance id to chrome/.

content/public/browser/browser_plugin_guest_delegate.h

Index: content/public/browser/browser_plugin_guest_delegate.h
diff --git a/content/public/browser/browser_plugin_guest_delegate.h b/content/public/browser/browser_plugin_guest_delegate.h
index 7ae4eb8d997f3f863383765ff663e8d44ee95ff3..51e89c1fa16d441bee86b37a46c49f9733d10197 100644
--- a/content/public/browser/browser_plugin_guest_delegate.h
+++ b/content/public/browser/browser_plugin_guest_delegate.h
@@ -17,6 +17,10 @@
 #include "ui/gfx/size.h"
 #include "url/gurl.h"
 
+namespace base {
+class DictionaryValue;
+}  // namespace base
+
 namespace blink {
 class WebGestureEvent;
 }  // namespace blink
@@ -53,7 +57,7 @@ class CONTENT_EXPORT BrowserPluginGuestDelegate {
   virtual void Close() {}
 
   // Notification that the embedder has completed attachment.
-  virtual void DidAttach() {}
+  virtual void DidAttach(const base::DictionaryValue& extra_params) {}
 
   // Informs the delegate that the guest render process is gone. |status|
   // indicates whether the guest was killed, crashed, or was terminated