Extract ArcTermsOfServiceNegotiator implementation.

chrome/browser/chromeos/arc/arc_session_manager_unittest.cc

Index: chrome/browser/chromeos/arc/arc_session_manager_unittest.cc
diff --git a/chrome/browser/chromeos/arc/arc_session_manager_unittest.cc b/chrome/browser/chromeos/arc/arc_session_manager_unittest.cc
index 574acaa4a2ca934eb0fd0c5d52ed859fea75a613..7403af09cf93d450cc35f63daf901471a04261de 100644
--- a/chrome/browser/chromeos/arc/arc_session_manager_unittest.cc
+++ b/chrome/browser/chromeos/arc/arc_session_manager_unittest.cc
@@ -288,6 +288,8 @@ TEST_F(ArcSessionManagerTest, SignInStatus) {
   arc_session_manager()->OnPrimaryUserProfilePrepared(profile());
   EXPECT_EQ(ArcSessionManager::State::SHOWING_TERMS_OF_SERVICE,
             arc_session_manager()->state());
+  // Emulate to accept the terms of service.

[hidehiko, 2016/11/29 17:43:29]

Note: I seem to overlooked the real test failure for some reason in PS1...
Fixed.

+  prefs->SetBoolean(prefs::kArcTermsAccepted, true);
   arc_session_manager()->StartArc();
   EXPECT_EQ(ArcSessionManager::State::ACTIVE, arc_session_manager()->state());
   EXPECT_TRUE(bridge_service()->ready());