Tether: Break helper TimerFactory out of BleConnectionManager and HostScanCache.

chromeos/components/tether/ble_connection_manager_unittest.cc

Index: chromeos/components/tether/ble_connection_manager_unittest.cc
diff --git a/chromeos/components/tether/ble_connection_manager_unittest.cc b/chromeos/components/tether/ble_connection_manager_unittest.cc
index b18e5ef5f6602de0538ef02351761d6bd8a806be..86cb008878856aca303202853c068376c0bcbab1 100644
--- a/chromeos/components/tether/ble_connection_manager_unittest.cc
+++ b/chromeos/components/tether/ble_connection_manager_unittest.cc
@@ -8,6 +8,7 @@
 #include "base/timer/mock_timer.h"
 #include "chromeos/components/tether/ble_constants.h"
 #include "chromeos/components/tether/proto/tether.pb.h"
+#include "chromeos/components/tether/timer_factory.h"
 #include "components/cryptauth/ble/bluetooth_low_energy_weave_client_connection.h"
 #include "components/cryptauth/bluetooth_throttler.h"
 #include "components/cryptauth/connection.h"
@@ -60,6 +61,14 @@ struct ReceivedMessage {
   std::string payload;
 };
 
+class MockTimerFactory : public TimerFactory {
+ public:
+  std::unique_ptr<base::Timer> CreateOneShotTimer() override {
+    return base::MakeUnique<base::MockTimer>(false /* retains_user_task */,
+                                             false /* is_repeating */);
+  }
+};
+
 class TestObserver : public BleConnectionManager::Observer {
  public:
   TestObserver() {}
@@ -229,14 +238,6 @@ class BleConnectionManagerTest : public testing::Test {
     std::string expected_device_address_;
   };
 
-  class MockTimerFactory : public BleConnectionManager::TimerFactory {
-   public:
-    std::unique_ptr<base::Timer> CreateTimer() override {
-      return base::MakeUnique<base::MockTimer>(false /* retains_user_task */,
-                                               false /* is_repeating */);
-    }
-  };
-
   BleConnectionManagerTest() : test_devices_(CreateTestDevices(4)) {
     // These tests assume a maximum of two concurrent advertisers. Some of the
     // multi-device tests would need to be re-written if this constant changes.