Add possibility to define data callback to BitmapFetcher

chrome/browser/banners/app_banner_data_fetcher.cc

Index: chrome/browser/banners/app_banner_data_fetcher.cc
diff --git a/chrome/browser/banners/app_banner_data_fetcher.cc b/chrome/browser/banners/app_banner_data_fetcher.cc
index 8f973ce45678d382aa8013f8ff63d597bc113674..a627079a86c24ffc80374ee6fd757f98ee3752cc 100644
--- a/chrome/browser/banners/app_banner_data_fetcher.cc
+++ b/chrome/browser/banners/app_banner_data_fetcher.cc
@@ -197,11 +197,12 @@ bool AppBannerDataFetcher::FetchIcon(const GURL& image_url) {
   Profile* profile =
       Profile::FromBrowserContext(web_contents->GetBrowserContext());
   bitmap_fetcher_.reset(new chrome::BitmapFetcher(image_url, this));
-  bitmap_fetcher_->Start(
+  bitmap_fetcher_->Init(
       profile->GetRequestContext(),
       std::string(),
       net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE,
       net::LOAD_NORMAL);
+  bitmap_fetcher_->Start();
   return true;
 }