[Sync] Migrate SyncInternalsMessageHandler off CallJavascriptFunctionUnsafe.

components/sync/driver/about_sync_util_unittest.cc

Index: components/sync/driver/about_sync_util_unittest.cc
diff --git a/components/sync/driver/about_sync_util_unittest.cc b/components/sync/driver/about_sync_util_unittest.cc
index 7a6effb2467c40d8d5206e5b624347ff7c722a55..1ad4d4e4ffbcd18f8ac8f2ce74a0caa2c9af9cc4 100644
--- a/components/sync/driver/about_sync_util_unittest.cc
+++ b/components/sync/driver/about_sync_util_unittest.cc
@@ -38,8 +38,8 @@ class SyncServiceMock : public FakeSyncService {
 TEST(SyncUIUtilTestAbout, ConstructAboutInformationWithUnrecoverableErrorTest) {
   SyncServiceMock service;
 
-  std::unique_ptr<base::DictionaryValue> strings(ConstructAboutInformation(
-      &service, nullptr, version_info::Channel::UNKNOWN));
+  std::unique_ptr<base::DictionaryValue> strings(
+      ConstructAboutInformation(&service, version_info::Channel::UNKNOWN));
 
   EXPECT_TRUE(strings->HasKey("unrecoverable_error_detected"));
 }