[Passwords] Drop Default launchPasswordCheckup Impl

This change drops the default launchPasswordCheckup implementation,
since it is now implemented downstream.

Bug: 986317
Change-Id: I50d5a3d8c346b6f3d288bc167376f861dd460a67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1777541Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691985}

chrome/android/java/src/org/chromium/chrome/browser/password_manager/GooglePasswordManagerUIProvider.java

@@ -23,8 +23,5 @@ public interface GooglePasswordManagerUIProvider {
      * @param activity The activity from which to launch the Password Checkup.
      * @return Whether launching the Password Checkup was possible or not.
      **/
-    // TODO(crbug.com/986317): Drop the default action once the method is implemented downstream.
-    default boolean launchPasswordCheckup(Activity activity) {
-        return false;
-    }
+    boolean launchPasswordCheckup(Activity activity);
 }