Move CancelableTaskTracker to //base/task/CancelableTaskTracker.

chrome/browser/favicon/favicon_handler.cc

Index: chrome/browser/favicon/favicon_handler.cc
diff --git a/chrome/browser/favicon/favicon_handler.cc b/chrome/browser/favicon/favicon_handler.cc
index 3e817c6f7a5697267cbc3ae978dd599d9af52394..3785bbc21a7b448028a0a5853c2d07f8bcbbc5a2 100644
--- a/chrome/browser/favicon/favicon_handler.cc
+++ b/chrome/browser/favicon/favicon_handler.cc
@@ -449,7 +449,7 @@ void FaviconHandler::UpdateFaviconMappingAndFetch(
     const GURL& icon_url,
     chrome::IconType icon_type,
     const FaviconService::FaviconResultsCallback& callback,
-    CancelableTaskTracker* tracker) {
+    base::CancelableTaskTracker* tracker) {
   // TODO(pkotwicz): pass in all of |image_urls_| to
   // UpdateFaviconMappingsAndFetch().
   std::vector<GURL> icon_urls;
@@ -462,7 +462,7 @@ void FaviconHandler::GetFavicon(
     const GURL& icon_url,
     chrome::IconType icon_type,
     const FaviconService::FaviconResultsCallback& callback,
-    CancelableTaskTracker* tracker) {
+    base::CancelableTaskTracker* tracker) {
   GetFaviconService()->GetFavicon(
       icon_url, icon_type, preferred_icon_size(), callback, tracker);
 }
@@ -471,7 +471,7 @@ void FaviconHandler::GetFaviconForURL(
     const GURL& page_url,
     int icon_types,
     const FaviconService::FaviconResultsCallback& callback,
-    CancelableTaskTracker* tracker) {
+    base::CancelableTaskTracker* tracker) {
   GetFaviconService()->GetFaviconForURL(
       FaviconService::FaviconForURLParams(page_url, icon_types,
                                           preferred_icon_size()),