Consolidate icon loading on ChromeOS

chrome/browser/ui/webui/fileicon_source.h

Index: chrome/browser/ui/webui/fileicon_source.h
diff --git a/chrome/browser/ui/webui/fileicon_source.h b/chrome/browser/ui/webui/fileicon_source.h
index f42fabf4bde323edb623b5f6d85c05bd506b4448..983827a6deb45640f515aea11e69a21de21b31c1 100644
--- a/chrome/browser/ui/webui/fileicon_source.h
+++ b/chrome/browser/ui/webui/fileicon_source.h
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/file_path.h"
 #include "chrome/browser/icon_manager.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 
@@ -36,14 +37,17 @@ class FileIconSource : public ChromeURLDataManager::DataSource {
       IconManager::Handle request_handle,
       gfx::Image* icon);
 
- private:
+ protected:
   virtual ~FileIconSource();
 
-  CancelableRequestConsumerT<int, 0> cancelable_consumer_;
+  // Once the |path| and |icon_size| has been determined from the request, this
+  // function is called to perform the actual fetch.
+  virtual void FetchFileIcon(const FilePath& path,
+                             IconLoader::IconSize icon_size,
+                             int request_id);
 
-  // Raw PNG representation of the favicon to show when the favicon
-  // database doesn't have a favicon for a webpage.
-  scoped_refptr<RefCountedBytes> default_favicon_;
+ private:
+  CancelableRequestConsumerT<int, 0> cancelable_consumer_;
 
   DISALLOW_COPY_AND_ASSIGN(FileIconSource);
 };