[Telemetry] Remove "_by_url" string from page-specific results.

tools/telemetry/telemetry/page/html_page_measurement_results_unittest.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.
 import os
 import StringIO
 import unittest
 
 from telemetry.page import html_page_measurement_results
 from telemetry.page import page_set
 
@@ skipping 51 matching lines @@
             "a": {
               "current": [3, 7],
               "units": "seconds",
               "important": True
             },
             "telemetry_page_measurement_results.num_failed": {
               "current": [0],
               "units": "count",
               "important": False
             },
-            "a_by_url.http://www.bar.com/": {
+            "a.http://www.bar.com/": {
               "current": [7],
               "units": "seconds",
               "important": False
             },
             "telemetry_page_measurement_results.num_errored": {
               "current": [0],
               "units": "count",
               "important": False
             },
-            "a_by_url.http://www.foo.com/": {
+            "a.http://www.foo.com/": {
               "current": [3],
               "units": "seconds",
               "important": False
             }
           }
         }
       },
       "revision": "revision"
     }
     self.assertEquals(expected, results.GetResults())
@@ skipping 24 matching lines @@
               "a": {
                 "current": [3, 7],
                 "units": "seconds",
                 "important": True
               },
               "telemetry_page_measurement_results.num_failed": {
                 "current": [0],
                 "units": "count",
                 "important": False
               },
-              "a_by_url.http://www.bar.com/": {
+              "a.http://www.bar.com/": {
                 "current": [7],
                 "units": "seconds",
                 "important": False
               },
               "telemetry_page_measurement_results.num_errored": {
                 "current": [0],
                 "units": "count",
                 "important": False
               },
-              "a_by_url.http://www.foo.com/": {
+              "a.http://www.foo.com/": {
                 "current": [3],
                 "units": "seconds",
                 "important": False
               }
             }
           }
         },
         "revision": "revision"
       },
       {
         "platform": "browser_type",
         "buildTime": "build_time",
         "label": None,
         "tests": {
           "test_name": {
             "metrics": {
               "a": {
                 "current": [4, 8],
                 "units": "seconds",
                 "important": True
               },
               "telemetry_page_measurement_results.num_failed": {
                 "current": [0],
                 "units": "count",
                 "important": False,
               },
-              "a_by_url.http://www.bar.com/": {
+              "a.http://www.bar.com/": {
                 "current": [8],
                 "units": "seconds",
                 "important": False
               },
               "telemetry_page_measurement_results.num_errored": {
                 "current": [0],
                 "units": "count",
                 "important": False
               },
-              "a_by_url.http://www.foo.com/": {
+              "a.http://www.foo.com/": {
                 "current": [4],
                 "units": "seconds",
                 "important": False
               }
             }
           }
         },
         "revision": "revision"
       }]
     self.assertEquals(expected, results.GetCombinedResults())
@@ skipping 24 matching lines @@
             "a": {
               "current": [5, 9],
               "units": "seconds",
               "important": True
             },
             "telemetry_page_measurement_results.num_failed": {
               "current": [0],
               "units": "count",
               "important": False
             },
-            "a_by_url.http://www.bar.com/": {
+            "a.http://www.bar.com/": {
               "current": [9],
               "units": "seconds",
               "important": False
             },
             "telemetry_page_measurement_results.num_errored": {
               "current": [0],
               "units": "count",
               "important": False
             },
-            "a_by_url.http://www.foo.com/": {
+            "a.http://www.foo.com/": {
               "current": [5],
               "units": "seconds",
               "important": False
             }
           }
         }
       },
       "revision": "revision"
     }]
     self.assertEquals(expected, results.GetCombinedResults())
     self.assertTrue(len(output_file.getvalue()) < last_output_len)