aw: Generalize destroy runnable hasRun

android_webview/java/src/org/chromium/android_webview/CleanupReference.java

Index: android_webview/java/src/org/chromium/android_webview/CleanupReference.java
diff --git a/android_webview/java/src/org/chromium/android_webview/CleanupReference.java b/android_webview/java/src/org/chromium/android_webview/CleanupReference.java
index 80a6bd93ae67328c279e13c0fa825f6c73274511..73f3b600c6955de5afd75bb01c1772d8d4005dd7 100644
--- a/android_webview/java/src/org/chromium/android_webview/CleanupReference.java
+++ b/android_webview/java/src/org/chromium/android_webview/CleanupReference.java
@@ -146,6 +146,10 @@ public class CleanupReference extends WeakReference<Object> {
         handleOnUiThread(REMOVE_REF);
     }
 
+    public boolean hasCleanedUp() {
+        return mCleanupTask == null;
+    }
+
     private void handleOnUiThread(int what) {
         Message msg = Message.obtain(LazyHolder.sHandler, what, this);
         if (Looper.myLooper() == msg.getTarget().getLooper()) {