Move RequestPpapiBrokerPermission from WebContentsObserver to WebContentsDelegate.

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index b649c3c580ccea31e71af49d594e4004ebf4efb8..97c8577828083da8e92cce015c686eedd6d3c21c 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -418,6 +418,14 @@ class CONTENT_EXPORT WebContentsDelegate {
       const MediaStreamRequest* request,
       const MediaResponseCallback& callback) {}
 
+  // Requests permission to access the PPAPI broker. The passed in |callback|
+  // should be called with the result.
+  virtual void RequestPpapiBrokerPermission(
+      WebContents* web_contents,
+      const GURL& url,
+      const FilePath& plugin_path,
+      const base::Callback<void(bool)>& callback);
+
 #if defined(OS_ANDROID)
   // Called when a compositing layer becomes available for this web contents
   // so the delegate can add it to the layer tree.