Trust the renderer's same-document navigation flag if it is a same-origin nav.

android_webview/java/src/org/chromium/android_webview/AwContentsClient.java

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.android_webview;
 
 import android.content.pm.ActivityInfo;
 import android.graphics.Bitmap;
 import android.graphics.Picture;
 import android.net.http.SslError;
@@ skipping 71 matching lines @@
                                     failingUrl);
                 }
                 // Need to call onPageFinished after onReceivedError (if there is an error) for
                 // backwards compatibility with the classic webview.
                 AwContentsClient.this.onPageFinished(failingUrl);
             }
         }
 
         @Override
         public void didNavigateMainFrame(String url, String baseUrl,
-                boolean isNavigationToDifferentPage, boolean isNavigationInPage) {
+                boolean isNavigationToDifferentPage, boolean isFragmentNavigation) {
             // This is here to emulate the Classic WebView firing onPageFinished for main frame
             // navigations where only the hash fragment changes.
-            if (isNavigationInPage) {
+            if (isFragmentNavigation) {
                 AwContentsClient.this.onPageFinished(url);
             }
         }
 
         @Override
         public void didNavigateAnyFrame(String url, String baseUrl, boolean isReload) {
             AwContentsClient.this.doUpdateVisitedHistory(url, isReload);
         }
 
     }
@@ skipping 146 matching lines @@
     public abstract void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches,
             boolean isDoneCounting);
 
     /**
      * Called whenever there is a new content picture available.
      * @param picture New picture.
      */
     public abstract void onNewPicture(Picture picture);
 
 }