Move ArcSessionRunner from ArcBridgeService to ArcSessionManager.

chrome/browser/chromeos/arc/arc_session_manager_browsertest.cc

Index: chrome/browser/chromeos/arc/arc_session_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/arc/arc_session_manager_browsertest.cc b/chrome/browser/chromeos/arc/arc_session_manager_browsertest.cc
index 8ca0fd5c89f5c2601cb718af56acf9db0cee2069..24c24d5d1214b9d14c39a2a36a6df1f4ee22b60c 100644
--- a/chrome/browser/chromeos/arc/arc_session_manager_browsertest.cc
+++ b/chrome/browser/chromeos/arc/arc_session_manager_browsertest.cc
@@ -154,10 +154,6 @@ class ArcSessionManagerTest : public InProcessBrowserTest {
     chromeos::DBusThreadManager::GetSetterForTesting()->SetSessionManagerClient(
         std::unique_ptr<chromeos::SessionManagerClient>(
             fake_session_manager_client));
-
-    // Mock out ARC instance.
-    ArcServiceManager::SetArcSessionRunnerForTesting(
-        base::MakeUnique<ArcSessionRunner>(base::Bind(FakeArcSession::Create)));
   }
 
   void SetUpOnMainThread() override {
@@ -166,6 +162,8 @@ class ArcSessionManagerTest : public InProcessBrowserTest {
     // Init ArcSessionManager for testing.
     ArcSessionManager::DisableUIForTesting();
     ArcSessionManager::EnableCheckAndroidManagementForTesting();
+    ArcSessionManager::Get()->SetArcSessionRunnerForTesting(
+        base::MakeUnique<ArcSessionRunner>(base::Bind(FakeArcSession::Create)));
 
     EXPECT_TRUE(temp_dir_.CreateUniqueTempDir());