DocumentLoader::isCommittedButEmpty is timing-dependent.

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 6fd8d1fa6d535b9da83ab8d1f7d3bb47fecf0b51..a98057a4637da49194007cea9199dedd19c32741 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -528,12 +528,14 @@ public class AwContents implements SmartClipProvider,
 
             if (awWebResourceResponse != null && awWebResourceResponse.getData() == null) {
                 // In this case the intercepted URLRequest job will simulate an empty response
-                // which doesn't trigger the onReceivedError callback. For WebViewClassic
-                // compatibility we synthesize that callback. http://crbug.com/180950
+                // which doesn't trigger the onReceivedError or onPageFinished callbacks. For
+                // WebViewClassic compatibility we synthesize those callbacks.
+                // http://crbug.com/180950
                 mContentsClient.getCallbackHelper().postOnReceivedError(
                         request,
                         /* error description filled in by the glue layer */
                         new AwContentsClient.AwWebResourceError());
+                mContentsClient.getCallbackHelper().postOnPageFinished(request.url);
             }
             return awWebResourceResponse;
         }