Chromecast buildfix: satisfy new CreateZoomLevelDelegate API.

chromecast/browser/cast_browser_context.h

Index: chromecast/browser/cast_browser_context.h
diff --git a/chromecast/browser/cast_browser_context.h b/chromecast/browser/cast_browser_context.h
index 931d886fd131d1f3b2624b1b24a9e621f2586d0b..a15e169546385646667c1a3953be6da36ed43fb6 100644
--- a/chromecast/browser/cast_browser_context.h
+++ b/chromecast/browser/cast_browser_context.h
@@ -26,6 +26,8 @@ class CastBrowserContext : public content::BrowserContext {
   virtual ~CastBrowserContext();
 
   // BrowserContext implementation:
+  virtual scoped_ptr<content::ZoomLevelDelegate> CreateZoomLevelDelegate(
+      const base::FilePath& partition_path) override;
   virtual base::FilePath GetPath() const override;
   virtual bool IsOffTheRecord() const override;
   virtual net::URLRequestContextGetter* GetRequestContext() override;