Add preexisting local extensions to sync bundle when sync is enabled.

chrome/browser/sync/test/integration/two_client_extensions_sync_test.cc

Index: chrome/browser/sync/test/integration/two_client_extensions_sync_test.cc
diff --git a/chrome/browser/sync/test/integration/two_client_extensions_sync_test.cc b/chrome/browser/sync/test/integration/two_client_extensions_sync_test.cc
index d12414a3e756c6f9380d97d900acf8432f27802b..54fae52d06d5a8df83c31ecbafc6a7218c61edbb 100644
--- a/chrome/browser/sync/test/integration/two_client_extensions_sync_test.cc
+++ b/chrome/browser/sync/test/integration/two_client_extensions_sync_test.cc
@@ -279,5 +279,29 @@ IN_PROC_BROWSER_TEST_F(TwoClientExtensionsSyncTest, DisableSync) {
   ASSERT_TRUE(AllProfilesHaveSameExtensionsAsVerifier());
 }
 
+// Regression test for bug 104399: ensure that an extension installed prior to
+// setting up sync, when uninstalled, is also uninstalled from sync.
+IN_PROC_BROWSER_TEST_F(TwoClientExtensionsSyncTest,
+                       UninstallPreinstalledExtensions) {
+  ASSERT_TRUE(SetupClients());
+  ASSERT_TRUE(AllProfilesHaveSameExtensionsAsVerifier());
+
+  InstallExtension(GetProfile(0), 0);
+  InstallExtension(verifier(), 0);
+
+  ASSERT_TRUE(SetupSync());
+
+  InstallExtensionsPendingForSync(GetProfile(0));
+  InstallExtensionsPendingForSync(GetProfile(1));
+  ASSERT_TRUE(AwaitQuiescence());
+  ASSERT_TRUE(AllProfilesHaveSameExtensionsAsVerifier());
+
+  UninstallExtension(GetProfile(0), 0);
+  UninstallExtension(verifier(), 0);
+
+  ASSERT_TRUE(AwaitQuiescence());
+  ASSERT_TRUE(AllProfilesHaveSameExtensionsAsVerifier());
+}
+
 // TODO(akalin): Add tests exercising:
 //   - Offline installation/uninstallation behavior