browser: Move FindBrowserWithWebContents() into chrome namespace.

BUG=133088
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Review URL: https://chromiumcodereview.appspot.com/11434074

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170686 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_tab_util.cc b/chrome/browser/extensions/extension_tab_util.cc
index 15eab00..729deb5 100644
--- a/chrome/browser/extensions/extension_tab_util.cc
+++ b/chrome/browser/extensions/extension_tab_util.cc
@@ -268,7 +268,7 @@
 // static
 extensions::WindowController* ExtensionTabUtil::GetWindowControllerOfTab(
     const WebContents* web_contents) {
-  Browser* browser = browser::FindBrowserWithWebContents(web_contents);
+  Browser* browser = chrome::FindBrowserWithWebContents(web_contents);
   if (browser != NULL)
     return browser->extension_window_controller();