move favicon download code from chrome/ into content/

chrome/browser/favicon/DEPS

 include_rules = [
   # Favicon is being made into a Browser Component, so we have these
   # three basic rules followed by temporary exceptions.  Please don't
   # add to the list of exceptions!
   "-chrome/browser",
   "+chrome/browser/api",
   "+chrome/browser/common",
   "+chrome/browser/favicon",
 
   # Permanently-allowed DEPS beyond the standard Browser
@@ skipping 16 matching lines @@
   "!chrome/browser/profiles/profile_dependency_manager.h",
   "!chrome/browser/profiles/profile_keyed_service.h",
   "!chrome/browser/profiles/profile_keyed_service_factory.h",
   "!chrome/browser/ui/webui/chrome_web_ui_controller_factory.h",
   # Do not add to the list of temporarily-allowed dependencies above,
   # and please do not introduce more #includes of these files.
 ]
 
 specific_include_rules = {
   # TODO(caitkp): Look into removing history/ dependencies.
-  'favicon_download_helper(_delegate)*\.(h|cc)': [
-    "-chrome",
-    "-chrome/browser",
-    "+chrome/browser/favicon/favicon_download_helper.h",
-    "+chrome/browser/favicon/favicon_download_helper_delegate.h",
-    "+chrome/browser/favicon/favicon_util.h",
-    "+chrome/common/icon_messages.h",
-    "+chrome/common/favicon_url.h",
-  ],
-
   'favicon_util\.(h|cc)': [
     "-chrome",
     "-chrome/browser",
     "+chrome/browser/favicon/favicon_util.h",
     "+chrome/common/icon_messages.h",
     "!chrome/browser/history/history_types.h",
     "!chrome/browser/history/select_favicon_frames.h",
   ]
 }