[cros] Initial user image loading and repeated profile image loading fixes.

chrome/browser/chromeos/login/profile_image_downloader.h

Index: chrome/browser/chromeos/login/profile_image_downloader.h
diff --git a/chrome/browser/chromeos/login/profile_image_downloader.h b/chrome/browser/chromeos/login/profile_image_downloader.h
index 2a9f9094dfc944d4cc3a878b13639f1f1a8aa410..8701b343e0aff683a5c8b48ed01438f9011d405f 100644
--- a/chrome/browser/chromeos/login/profile_image_downloader.h
+++ b/chrome/browser/chromeos/login/profile_image_downloader.h
@@ -34,7 +34,8 @@ class ProfileImageDownloader : public content::URLFetcherDelegate,
     kDownloadResultsCount
   };
 
-  // Reports on success or failure of Profile image download.
+  // Reports on success or failure of Profile image download. It is OK to
+  // delete the |ProfileImageDownloader| instance in any of these handlers.
   class Delegate {
    public:
     virtual ~Delegate() {}
@@ -55,7 +56,7 @@ class ProfileImageDownloader : public content::URLFetcherDelegate,
 
   // Starts downloading the picture if the necessary authorization token is
   // ready. If not, subscribes to token service and starts fetching if the
-  // token is available.
+  // token is available. Should not be called more than once.
   void Start();
 
  private: