Remove unused AppHooks method

Remove unused method now that downstream has been updated. See:
https://crrev.com/i/3409426.

Bug: 1102812
Change-Id: I59a8ce9629041fd290b2ca606497a7e733c81da7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2541671Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829836}

chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java

@@ -256,17 +256,6 @@ public abstract class AppHooks {
                 new AppRestrictionsProvider(ContextUtils.getApplicationContext()));
     }
 
-    /**
-     * TODO(crbug.com/1102812) : Remove this method after updating the downstream to use the new
-     * method {@link getOfflinePagesCctAllowlist} instead.
-     * @return A list of allowlisted apps that are allowed to receive notification when the
-     * set of offlined pages downloaded on their behalf has changed. Apps are listed by their
-     * package name.
-     */
-    public List<String> getOfflinePagesCctWhitelist() {
-        return Collections.emptyList();
-    }
-
     /**
      * @return A list of allowlisted apps that are allowed to receive notification when the
      * set of offlined pages downloaded on their behalf has changed. Apps are listed by their