Remove unused callback and handler for isUVPAA

This CL aims at removing rest of the code to use gmscore isUVPAA.

This CL is the third of 3 CLs to add isUVPAA implemenration on clank
and remove the flow to call isUVPAA that gmscore supports.
First CL:
https://chromium-review.googlesource.com/c/chromium/src/+/1739973
Second CL:
https://chrome-internal-review.googlesource.com/c/clank/internal/apps/+/1587528

Bug: n/a
Change-Id: I8f045738e3b3213184e7109bb42f1924ad8c55b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1750406
Commit-Queue: Suzy Li <suzyli@google.com>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686483}

chrome/android/java/src/org/chromium/chrome/browser/webauth/AuthenticatorImpl.java

@@ -40,8 +40,6 @@ public class AuthenticatorImpl extends HandlerResponseCallback implements Authen
             .Callback2<Integer, MakeCredentialAuthenticatorResponse> mMakeCredentialCallback;
     private org.chromium.mojo.bindings.Callbacks
             .Callback2<Integer, GetAssertionAuthenticatorResponse> mGetAssertionCallback;
-    private org.chromium.mojo.bindings.Callbacks
-            .Callback1<Boolean> mIsUserVerifyingPlatformAuthenticatorAvailableCallback;
 
     /**
      * Builds the Authenticator service implementation.

chrome/android/java/src/org/chromium/chrome/browser/webauth/Fido2ApiHandler.java

@@ -50,7 +50,4 @@ public class Fido2ApiHandler {
 
     protected void getAssertion(PublicKeyCredentialRequestOptions options,
             RenderFrameHost frameHost, HandlerResponseCallback callback) {}
-
-    protected void isUserVerifyingPlatformAuthenticatorAvailable(
-            RenderFrameHost frameHost, HandlerResponseCallback callback) {}
 }

chrome/android/java/src/org/chromium/chrome/browser/webauth/HandlerResponseCallback.java

@@ -23,12 +23,6 @@ public class HandlerResponseCallback {
      */
     public void onSignResponse(Integer status, GetAssertionAuthenticatorResponse response){};
 
-    /**
-     * Callback for handling response from a request to call
-     * isUserVerifyingPlatformAuthenticatorAvailable.
-     */
-    public void onIsUserVerifyingPlatformAuthenticatorAvailableResponse(boolean isUVPAA){};
-
     /**
      * Callback for handling any errors from either register or sign requests.
      */