[Extensions] Remove the Infobar API

chrome/browser/extensions/extension_view_host.h

Index: chrome/browser/extensions/extension_view_host.h
diff --git a/chrome/browser/extensions/extension_view_host.h b/chrome/browser/extensions/extension_view_host.h
index 3566b31f5798d10ba272f66dd64f3bf1a686318d..63cb61e1de847d23e27e2574666936b0cb405de7 100644
--- a/chrome/browser/extensions/extension_view_host.h
+++ b/chrome/browser/extensions/extension_view_host.h
@@ -23,8 +23,8 @@ namespace extensions {
 class ExtensionView;
 
 // The ExtensionHost for an extension that backs a view in the browser UI. For
-// example, this could be an extension popup, infobar or dialog, but not a
-// background page.
+// example, this could be an extension popup or dialog, but not a background
+// page.
 // TODO(gbillock): See if we can remove WebContentsModalDialogManager here.
 class ExtensionViewHost
     : public ExtensionHost,
@@ -57,7 +57,6 @@ class ExtensionViewHost
 
   // ExtensionHost
   void OnDidStopLoading() override;
-  void OnDocumentAvailable() override;
   void LoadInitialURL() override;
   bool IsBackgroundPage() const override;
 
@@ -112,9 +111,6 @@ class ExtensionViewHost
   static scoped_ptr<ExtensionView> CreateExtensionView(ExtensionViewHost* host,
                                                        Browser* browser);
 
-  // Insert a default style sheet for Extension Infobars.
-  void InsertInfobarCSS();
-
   // Optional view that shows the rendered content in the UI.
   scoped_ptr<ExtensionView> view_;