Bug 846772 - Disable dynamic toolbar on robocop tests. r=kats,jmaher

Pretty much all of the robocop tests that involve input assumed a static UI.
Making them compatible with the dynamic toolbar would require a considerable
rethink, so turn it off by default. We can introduce robocop tests specifically
for the dynamic toolbar later.

testing/mochitest/runtestsremote.py

@@ -544,6 +544,7 @@ def main():
         options.extraPrefs.append('browser.search.suggest.enabled=true')
         options.extraPrefs.append('browser.search.suggest.prompted=true')
         options.extraPrefs.append('browser.viewport.scaleRatio=100')
+        options.extraPrefs.append('browser.chrome.dynamictoolbar=false')
 
         if (options.dm_trans == 'adb' and options.robocopPath):
           dm._checkCmd(["install", "-r", os.path.join(options.robocopPath, "robocop.apk")])