[Sync] Fix PSS.getPreferredDataTypes()

Part 3/3. Once any downstream uses that really wanted the
getActiveDataTypes() behavior are converted in 2/3, this CL can fix
getPreferredDataTypes().

BUG=466223

Review URL: https://codereview.chromium.org/1019733002

Cr-Commit-Position: refs/heads/master@{#321620}

chrome/android/java/src/org/chromium/chrome/browser/sync/ProfileSyncService.java

@@ -336,9 +336,7 @@ public class ProfileSyncService {
      * @return Set of preferred types.
      */
     public Set<ModelType> getPreferredDataTypes() {
-        // TODO(maxbogue): Correct this line to GetPreferredDataTypes once
-        // downstream uses are fixed.
-        long modelTypeSelection = nativeGetActiveDataTypes(mNativeProfileSyncServiceAndroid);
+        long modelTypeSelection = nativeGetPreferredDataTypes(mNativeProfileSyncServiceAndroid);
         return modelTypeSelectionToSet(modelTypeSelection);
     }