Modify all usage of PageMeasurement to use PageTest in tools/telemetry.

tools/telemetry/unittest_data/page_tests/page_test1.py

Index: tools/telemetry/unittest_data/page_tests/page_test1.py
diff --git a/tools/telemetry/unittest_data/page_tests/page_test1.py b/tools/telemetry/unittest_data/page_tests/page_test1.py
new file mode 100644
index 0000000000000000000000000000000000000000..ae64472a0273d3a6567628c9b5404e2de949282c
--- /dev/null
+++ b/tools/telemetry/unittest_data/page_tests/page_test1.py
@@ -0,0 +1,14 @@
+# Copyright 2014 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.
+
+"""A simple PageTest used by page/record_wpr.py's unit tests."""
+
+from telemetry.page import page_test
+
+class MockPageTestOne(page_test.PageTest):
+  def __init__(self):
+    super(MockPageTestOne, self).__init__(action_name_to_run="RunFoo")
+
+  def ValidateAndMeasurePage(self, page, tab, results):
+    pass