[Android Java Bridge] Recycle old V8 wrapper objects on navigations

content/public/android/javatests/src/org/chromium/content/browser/JavaBridgeBasicsTest.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.os.Handler;
 import android.os.Looper;
 import android.test.suitebuilder.annotation.SmallTest;
 
@@ skipping 315 matching lines @@
     @SmallTest
     @Feature({"AndroidWebView", "Android-JavaBridge"})
     public void testObjectPersistsAcrossPageLoads() throws Throwable {
         assertEquals("object", executeJavaScriptAndGetStringResult("typeof testController"));
         synchronousPageReload();
         assertEquals("object", executeJavaScriptAndGetStringResult("typeof testController"));
     }
 
     @SmallTest
     @Feature({"AndroidWebView", "Android-JavaBridge"})
-    public void testClientPropertiesPersistAcrossPageLoads() throws Throwable {
+    public void testCustomPropertiesCleanedUpOnPageReloads() throws Throwable {
         assertEquals("object", executeJavaScriptAndGetStringResult("typeof testController"));
         executeJavaScript("testController.myProperty = 42;");
         assertEquals("42", executeJavaScriptAndGetStringResult("testController.myProperty"));
         synchronousPageReload();
-        assertEquals("42", executeJavaScriptAndGetStringResult("testController.myProperty"));
+        assertEquals("object", executeJavaScriptAndGetStringResult("typeof testController"));
+        assertEquals("undefined", executeJavaScriptAndGetStringResult("testController.myProperty"));
     }
 
     @SmallTest
     @Feature({"AndroidWebView", "Android-JavaBridge"})
     public void testSameObjectInjectedMultipleTimes() throws Throwable {
         class TestObject {
             private int mNumMethodInvocations;
             public void method() { mTestController.setIntValue(++mNumMethodInvocations); }
         }
         final TestObject testObject = new TestObject();
@@ skipping 550 matching lines @@
                 } while (mTestController.getStringValue() == null ||
                         // When an exception in an injected method happens, the function returns
                         // null. We ignore this and wait until the exception on the browser side
                         // will be thrown.
                         mTestController.getStringValue().equals("null"));
             }
         });
         return mTestController.getStringValue();
     }
 }