Properly handle disabling sync via the google dashboard.

chrome/browser/signin/signin_manager_unittest.cc

Index: chrome/browser/signin/signin_manager_unittest.cc
diff --git a/chrome/browser/signin/signin_manager_unittest.cc b/chrome/browser/signin/signin_manager_unittest.cc
index 8dc20b2de67ff68db2dd8e889ec931ed8fffd27f..56e0198d4a290c9950abdfa063f93f1d756dab75 100644
--- a/chrome/browser/signin/signin_manager_unittest.cc
+++ b/chrome/browser/signin/signin_manager_unittest.cc
@@ -654,3 +654,13 @@ TEST_F(SigninManagerTest, SignInWithOAuthChallengeOtp) {
   EXPECT_EQ(1U, google_login_success_.size());
   EXPECT_EQ(1U, google_login_failure_.size());
 }
+
+TEST_F(SigninManagerTest, SignOutWhileProhibited) {
+  manager_->Initialize(profile_.get());
+  EXPECT_TRUE(manager_->GetAuthenticatedUsername().empty());
+
+  manager_->SetAuthenticatedUsername("user@gmail.com");
+  manager_->ProhibitSignout();
+  manager_->SignOut();
+  EXPECT_FALSE(manager_->GetAuthenticatedUsername().empty());
+}