Move BrowserThread to content namespace.

TBR=owners
BUG=98716

Review URL: http://codereview.chromium.org/8437002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108270 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/component_updater/component_updater_service.cc b/chrome/browser/component_updater/component_updater_service.cc
index 63daf1f..c48b90f 100644
--- a/chrome/browser/component_updater/component_updater_service.cc
+++ b/chrome/browser/component_updater/component_updater_service.cc
@@ -31,6 +31,8 @@
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
 
+using content::BrowserThread;
+
 namespace {
 // Extends an omaha compatible update check url |query| string. Does
 // not mutate the string if it would be longer than |limit| chars.