[Unity][Android] Change title text color for sync error card

This CL changes the color of the title text in sync error card shown in
'Sync and Google services'. It is done by changing the type used by sync
error card from SyncErrorCardPreference to regular Preference. The title
color text is the only difference between SyncErrorCardPreference and
Preference.

Bug: 888938
Change-Id: I99c3646c8770acf7a297f1c0bfef0a5f00eeec04
Reviewed-on: https://chromium-review.googlesource.com/1242461Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593939}

chrome/android/java/res/xml/sync_and_services_preferences.xml

@@ -8,7 +8,7 @@
         android:key="sign_in"
         android:title="@string/sign_in_to_chrome"/>
 
-    <org.chromium.chrome.browser.preferences.SyncErrorCardPreference
+    <Preference
         android:key="sync_error_card"
         android:icon="@drawable/sync_error"
         android:title="@string/sync_error_card_title"/>