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 f3316c2b4ac647cd0b9be6a7d2ebc4fd03b58417..573e138c020bd61cdbf8a997ad5b8db4d9eb8608 100644
--- a/content/public/browser/browser_plugin_guest_delegate.h
+++ b/content/public/browser/browser_plugin_guest_delegate.h
@@ -9,6 +9,10 @@
 #include "base/process/kill.h"
 #include "content/common/content_export.h"
 
+namespace base {
+class DictionaryValue;
+}  // namespace base
+
 namespace gfx {
 class Size;
 }  // namespace gfx
@@ -24,7 +28,7 @@ class CONTENT_EXPORT BrowserPluginGuestDelegate {
   virtual ~BrowserPluginGuestDelegate() {}
 
   // 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