Move RequestPpapiBrokerPermission from WebContentsObserver to WebContentsDelegate.

content/public/browser/web_contents_delegate.cc

Index: content/public/browser/web_contents_delegate.cc
diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
index f3b03d5836aa4dc344e8aab1cf44ae860a543a24..0425ec44a27c17aaadb5ea8078f89abeaaa46f25 100644
--- a/content/public/browser/web_contents_delegate.cc
+++ b/content/public/browser/web_contents_delegate.cc
@@ -143,6 +143,14 @@ void WebContentsDelegate::WebIntentDispatch(
   delete intents_dispatcher;
 }
 
+bool WebContentsDelegate::RequestPpapiBrokerPermission(
+    WebContents* web_contents,
+    const GURL& url,
+    const FilePath& plugin_path,
+    const base::Callback<void(bool)>& callback) {
+  return false;
+}
+
 WebContentsDelegate::~WebContentsDelegate() {
   while (!attached_contents_.empty()) {
     WebContents* web_contents = *attached_contents_.begin();