Rename MockTaskRunner into FakeTaskRunner

BUG: 24267885
Change-Id: Iaf72821cd9f6eee77a199dba7939dbbcb1e35402
Reviewed-on: https://weave-review.googlesource.com/1173
Reviewed-by: Vitaly Buka <vitalybuka@google.com>
diff --git a/libweave/src/privet/security_manager_unittest.cc b/libweave/src/privet/security_manager_unittest.cc
index 5c9fc2d..c85bd5f 100644
--- a/libweave/src/privet/security_manager_unittest.cc
+++ b/libweave/src/privet/security_manager_unittest.cc
@@ -19,7 +19,7 @@
 #include <base/strings/string_util.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
-#include <weave/provider/test/mock_task_runner.h>
+#include <weave/provider/test/fake_task_runner.h>
 
 #include "libweave/external/crypto/p224_spake.h"
 #include "libweave/src/data_encoding.h"
@@ -100,7 +100,7 @@
   }
 
   const base::Time time_ = base::Time::FromTimeT(1410000000);
-  provider::test::MockTaskRunner task_runner_;
+  provider::test::FakeTaskRunner task_runner_;
   SecurityManager security_{{PairingType::kEmbeddedCode},
                             "1234",
                             false,