[Telemetry] Reorganize everything.

tools/telemetry/telemetry/core/tab.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 web_contents
+from telemetry.core import web_contents
 
 DEFAULT_TAB_TIMEOUT = 60
 
 class Tab(web_contents.WebContents):
   """Represents a tab in the browser
 
   The important parts of the Tab object are in the runtime and page objects.
   E.g.:
       # Navigates the tab to a given url.
       tab.Navigate('http://www.google.com/')
@@ skipping 55 matching lines @@
     self._inspector_backend.PerformActionAndWaitForNavigate(
         action_function, timeout)
 
   def Navigate(self, url, timeout=DEFAULT_TAB_TIMEOUT):
     """Navigates to url."""
     self._inspector_backend.Navigate(url, timeout)
 
   def GetCookieByName(self, name, timeout=DEFAULT_TAB_TIMEOUT):
     """Returns the value of the cookie by the given |name|."""
     return self._inspector_backend.GetCookieByName(name, timeout)