[Telemetry] Reorganize everything.

tools/telemetry/telemetry/core/chrome/google_credentials_backend.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from telemetry import form_based_credentials_backend
+from telemetry.core.chrome import form_based_credentials_backend
 
 class GoogleCredentialsBackend(
     form_based_credentials_backend.FormBasedCredentialsBackend):
   def IsAlreadyLoggedIn(self, tab):
     return tab.EvaluateJavaScript(
         'document.getElementById("gb")!== null')
 
   @property
   def credentials_type(self):
     return 'google'
 
   @property
   def url(self):
     return 'https://accounts.google.com/'
 
   @property
   def login_form_id(self):
     return 'gaia_loginform'
 
   @property
   def login_input_id(self):
     return 'Email'
 
   @property
   def password_input_id(self):
     return 'Passwd'