[Sync] Clear LocalDeviceInfoProvider cache on sync DB destruction.

components/browser_sync/browser/profile_sync_service_unittest.cc

Index: components/browser_sync/browser/profile_sync_service_unittest.cc
diff --git a/components/browser_sync/browser/profile_sync_service_unittest.cc b/components/browser_sync/browser/profile_sync_service_unittest.cc
index 1c620ef08432f4b689480afa21897a16b5fe9f5f..c83b083c3f3550aeef485abd5d11abf0e71c0aed 100644
--- a/components/browser_sync/browser/profile_sync_service_unittest.cc
+++ b/components/browser_sync/browser/profile_sync_service_unittest.cc
@@ -625,8 +625,8 @@ TEST_F(ProfileSyncServiceTest, SignOutRevokeAccessToken) {
 }
 #endif
 
-// Verify that LastSyncedTime is cleared when the user signs out.
-TEST_F(ProfileSyncServiceTest, ClearLastSyncedTimeOnSignOut) {
+// Verify that LastSyncedTime and local DeviceInfo is cleared on sign out.
+TEST_F(ProfileSyncServiceTest, ClearDataOnSignOut) {
   IssueTestTokens();
   CreateService(ProfileSyncService::AUTO_START);
   ExpectDataTypeManagerCreation(1, GetDefaultConfigureCalledCallback());
@@ -635,6 +635,7 @@ TEST_F(ProfileSyncServiceTest, ClearLastSyncedTimeOnSignOut) {
   EXPECT_TRUE(service()->IsSyncActive());
   EXPECT_EQ(l10n_util::GetStringUTF16(IDS_SYNC_TIME_JUST_NOW),
             service()->GetLastSyncedTimeString());
+  EXPECT_TRUE(service()->GetLocalDeviceInfoProvider()->GetLocalDeviceInfo());
 
   // Sign out.
   service()->RequestStop(ProfileSyncService::CLEAR_DATA);
@@ -642,6 +643,7 @@ TEST_F(ProfileSyncServiceTest, ClearLastSyncedTimeOnSignOut) {
 
   EXPECT_EQ(l10n_util::GetStringUTF16(IDS_SYNC_TIME_NEVER),
             service()->GetLastSyncedTimeString());
+  EXPECT_FALSE(service()->GetLocalDeviceInfoProvider()->GetLocalDeviceInfo());
 }
 
 // Verify that the disable sync flag disables sync.