contacts: Rate-limit GData photo requests and handle 404s.

chrome/browser/chromeos/gdata/gdata_contacts_service.h

Index: chrome/browser/chromeos/gdata/gdata_contacts_service.h
diff --git a/chrome/browser/chromeos/gdata/gdata_contacts_service.h b/chrome/browser/chromeos/gdata/gdata_contacts_service.h
index faf4434ead919d37ceb8a11e4b3dc0fbf5d83dcd..bec9835cb1a08a63002c726a4d0fdfdc4fb01b01 100644
--- a/chrome/browser/chromeos/gdata/gdata_contacts_service.h
+++ b/chrome/browser/chromeos/gdata/gdata_contacts_service.h
@@ -68,8 +68,8 @@ class GDataContactsService : public GDataContactsServiceInterface {
 
   GDataAuthService* auth_service_for_testing();
 
-  void set_max_simultaneous_photo_downloads_for_testing(int max_downloads) {
-    max_simultaneous_photo_downloads_ = max_downloads;
+  void set_max_photo_downloads_per_second_for_testing(int max_downloads) {
+    max_photo_downloads_per_second_ = max_downloads;
   }
   void set_feed_url_for_testing(const GURL& url) {
     feed_url_for_testing_ = url;
@@ -103,9 +103,9 @@ class GDataContactsService : public GDataContactsServiceInterface {
   // member.
   GURL feed_url_for_testing_;
 
-  // Maximum number of photos we'll try to download at once (per
+  // Maximum number of photos we'll try to download per second (per
   // DownloadContacts() request).
-  int max_simultaneous_photo_downloads_;
+  int max_photo_downloads_per_second_;
 
   // Callback that's invoked to rewrite photo URLs for tests.
   // This is needed for tests that serve static feed data from a host/port