Disallow use of content::TestBrowserContext from //chrome/browser.

Remove the single such use that I found.

Full rationale in chromium-dev thread at http://goo.gl/QQG5wo. Short
story is that this can lead to an invalid cast (to Profile) in some of
the commonly-used test harnesses under //chrome/browser, and within
//chrome/browser a TestingProfile should be used instead.

BUG=none

Review URL: https://chromiumcodereview.appspot.com/22872009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@218006 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/DEPS b/chrome/browser/DEPS
index 6b18145..6e3345c 100644
--- a/chrome/browser/DEPS
+++ b/chrome/browser/DEPS
@@ -50,6 +50,9 @@
   "+win8/viewer",
   "+xib_localizers", # For generated mac localization helpers
 
+  # Unsafe to use from //chrome, see http://goo.gl/QQG5wo
+  "-content/public/test/test_browser_context.h",
+
   # TODO(stuartmorgan): Remove these by refactoring necessary code out of
   # webkit/. See crbug.com/146251
   # DO NOT ADD ANY MORE ITEMS TO THE LIST BELOW!