gpu: Fix broken import path in Maps test

content/test/gpu/gpu_tests/maps.py

 # Copyright 2013 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.
 
 """Runs a Google Maps pixel test.
 Performs several common navigation actions on the map (pan, zoom, rotate) then
 captures a screenshot and compares selected pixels against expected values"""
 
 import json
 import optparse
 import os
 import re
 
 import maps_expectations
 
 from telemetry import test
-from telemetry.core.backends import bitmap
+from telemetry.core import bitmap
 from telemetry.core import util
 from telemetry.page import page_test
 from telemetry.page import page_set
 
 test_data_dir = os.path.abspath(os.path.join(
     os.path.dirname(__file__), '..', '..', 'data', 'gpu'))
 
 default_generated_data_dir = os.path.join(test_data_dir, 'generated')
 
 class MapsValidator(page_test.PageTest):
@@ skipping 142 matching lines @@
           'navigate_steps': [
             { 'action': 'navigate' },
             { 'action': 'wait', 'javascript': 'window.testDone' }
           ],
           'pixel_expectations': 'data/maps_001_expectations.json'
         }
       ]
     }
 
     return page_set.PageSet.FromDict(page_set_dict, page_set_path)