Webdriver does not support extensions.

BUG=None
TEST=trybot
NOTRY=True

Review URL: https://chromiumcodereview.appspot.com/23935008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221845 0039d316-1c4b-4281-b951-d872f2087c98

tools/telemetry/telemetry/core/backends/webdriver/webdriver_desktop_browser_finder.py

@@ -49,7 +49,8 @@ class PossibleWebDriverBrowser(possible_browser.PossibleBrowser):
     return b
 
   def SupportsOptions(self, finder_options):
-    # TODO(chrisgao): Check if some options are not supported.
+    if len(finder_options.extensions_to_load) != 0:
+      return False
     return True
 
   @property