Adds the source ImageLoadingTracker to OnImageLoaded. I need this in a

chrome/browser/views/browser_actions_container.cc

Index: chrome/browser/views/browser_actions_container.cc
diff --git a/chrome/browser/views/browser_actions_container.cc b/chrome/browser/views/browser_actions_container.cc
index 32f0f028bbdd98f02c6b751d3a52acd719853973..f66b44c66ac4a8e8b4e32ad45fc1be9dd0d1fad1 100644
--- a/chrome/browser/views/browser_actions_container.cc
+++ b/chrome/browser/views/browser_actions_container.cc
@@ -139,7 +139,8 @@ void BrowserActionButton::ButtonPressed(views::Button* sender,
   panel_->OnBrowserActionExecuted(this, false);  // inspect_with_devtools
 }
 
-void BrowserActionButton::OnImageLoaded(SkBitmap* image, size_t index) {
+void BrowserActionButton::OnImageLoaded(ImageLoadingTracker* source,
+                                        SkBitmap* image, size_t index) {
   if (image)
     default_icon_ = *image;