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

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.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.content.browser;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.SearchManager;
 import android.content.ContentResolver;
@@ skipping 601 matching lines @@
         if (R.string.accessibility_content_view == 0) {
             Log.w(TAG, "Setting contentDescription to 'Web View' as no value was specified.");
         } else {
             contentDescription = mContext.getResources().getString(
                     R.string.accessibility_content_view);
         }
         mContainerView.setContentDescription(contentDescription);
         mWebContentsObserver = new WebContentsObserverAndroid(this) {
             @Override
             public void didNavigateMainFrame(String url, String baseUrl,
-                    boolean isNavigationToDifferentPage, boolean isNavigationInPage) {
+                    boolean isNavigationToDifferentPage, boolean isFragmentNavigation) {
                 if (!isNavigationToDifferentPage) return;
                 hidePopups();
                 resetScrollInProgress();
                 resetGestureDetection();
             }
 
             @Override
             public void renderProcessGone(boolean wasOomProtected) {
                 hidePopups();
                 resetScrollInProgress();
@@ skipping 2591 matching lines @@
             boolean enableHiding, boolean enableShowing, boolean animate);
 
     private native void nativeShowImeIfNeeded(long nativeContentViewCoreImpl);
 
     private native void nativeSetAccessibilityEnabled(
             long nativeContentViewCoreImpl, boolean enabled);
 
     private native void nativeExtractSmartClipData(long nativeContentViewCoreImpl,
             int x, int y, int w, int h);
 }