Revert of ts_mon: remove dependency on apiclient.

infra_libs/ts_mon/common/test/monitors_test.py

Index: infra_libs/ts_mon/common/test/monitors_test.py
diff --git a/infra_libs/ts_mon/common/test/monitors_test.py b/infra_libs/ts_mon/common/test/monitors_test.py
index 69ea8badb10f275451421a826fd9af31cf40887e..9943374af903991940026910d587a56a1848ee45 100644
--- a/infra_libs/ts_mon/common/test/monitors_test.py
+++ b/infra_libs/ts_mon/common/test/monitors_test.py
@@ -82,7 +82,7 @@
 
   @mock.patch('infra_libs.ts_mon.common.monitors.PubSubMonitor.'
               '_load_credentials', autospec=True)
-  @mock.patch('googleapiclient.discovery.build', autospec=True)
+  @mock.patch('apiclient.discovery.build', autospec=True)
   def test_send(self, _discovery, _load_creds):
     mon = monitors.PubSubMonitor('/path/to/creds.p8.json', 'myproject',
                                  'mytopic')
@@ -111,7 +111,7 @@
 
   @mock.patch('infra_libs.ts_mon.common.monitors.PubSubMonitor.'
               '_load_credentials', autospec=True)
-  @mock.patch('googleapiclient.discovery.build', autospec=True)
+  @mock.patch('apiclient.discovery.build', autospec=True)
   def test_send_uninitialized(self, discovery, _load_creds):
     """Test initialization retry logic, and also un-instrumented http path."""
     discovery.side_effect = EnvironmentError()  # Fail initialization.