Implement RunFileChooser for ExtensionHost, so that file input elements work in

chrome/browser/extensions/extension_host.cc

Index: chrome/browser/extensions/extension_host.cc
diff --git a/chrome/browser/extensions/extension_host.cc b/chrome/browser/extensions/extension_host.cc
index 576a04774610ffa7c8837ebe6a34b099d6eb805a..bf17b88a532bd8fbefc2ba7406f1090d3afff220 100644
--- a/chrome/browser/extensions/extension_host.cc
+++ b/chrome/browser/extensions/extension_host.cc
@@ -463,6 +463,11 @@ content::JavaScriptDialogCreator* ExtensionHost::GetJavaScriptDialogCreator() {
   return GetJavaScriptDialogCreatorInstance();
 }
 
+void ExtensionHost::RunFileChooser(TabContents* tab,
+                                   const content::FileChooserParams& params) {
+  Browser::RunFileChooserHelper(tab, params);
+}
+
 void ExtensionHost::AddNewContents(TabContents* source,
                                    TabContents* new_contents,
                                    WindowOpenDisposition disposition,