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

Index: android_webview/java/src/org/chromium/android_webview/AwContentsClient.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContentsClient.java b/android_webview/java/src/org/chromium/android_webview/AwContentsClient.java
index e5ce0273e995ae5e8bd6ed314a7e9244391d89fa..61486bb1ef72ef0ca2d18cce138e56228f50d66d 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContentsClient.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContentsClient.java
@@ -89,10 +89,10 @@ public abstract class AwContentsClient {
 
         @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);
             }
         }