Revert "[Passwords] Remove GooglePasswordManagerUIProvider..."

This reverts commit edb67fe5.

Reason for revert: This should go together with crrev.com/c/2406520

Original change's description:
> [Passwords] Remove GooglePasswordManagerUIProvider...
> 
> ...showGooglePasswordManager
> 
> Bug: 903249
> Change-Id: I8e76df331263ca52846fe48f94b2cbbc412a9ea7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2403282
> Reviewed-by: Ioana Pandele <ioanap@chromium.org>
> Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#806260}

TBR=jdoerrie@chromium.org,ioanap@chromium.org,wenbinzhang@google.com

Change-Id: I810cb1811b1dfcac85c55b1be76fd4bb38dffd45
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 903249
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2407852Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806445}

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

@@ -9,6 +9,17 @@ import android.app.Activity;
  * Shows the Google Password Manager UI if possible.
  */
 public interface GooglePasswordManagerUIProvider {
+    /**
+     * Shows the Google Password Manager UI if possible.
+     *
+     * @param activity The activity from which to launch the UI to manage passwords.
+     * @return Whether showing the Google Password Manager UI was possible or not.
+     * TODO(crbug.com/903249): Remove once downstream implementation is removed.
+     **/
+    default boolean showGooglePasswordManager(Activity activity) {
+        return false;
+    }
+
     /**
      * Launches the Password Checkup if possible.
      *