Fix a crash reported by monkey tests.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index aebda91e321f592e556799e3420e4d064a3ef890..038813cc1bf7f2f0f94ad705de1ad5b583641bd8 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -441,6 +441,11 @@ public class ContentViewCore
             @SuppressWarnings("deprecation")  // AbsoluteLayout
             public void setAnchorViewPosition(
                     View view, float x, float y, float width, float height) {
+                if (view.getParent() == null) {
+                    // Ignore. setAnchorViewPosition has been called after the anchor view has
+                    // already been released.
+                    return;
+                }
                 assert view.getParent() == mContainerViewAtCreation;
 
                 float scale = (float) DeviceDisplayInfo.create(mContext).getDIPScale();