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/memory_details_win.cc b/chrome/browser/memory_details_win.cc
index 2abf2d7..d94000c 100644
--- a/chrome/browser/memory_details_win.cc
+++ b/chrome/browser/memory_details_win.cc
@@ -23,6 +23,8 @@
 #include "grit/chromium_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
+using content::BrowserThread;
+
 // Known browsers which we collect details for.
 enum {
   CHROME_BROWSER = 0,