Add tab reparenting

chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java b/chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java
index cd0a59ae9e74325ce7629ea57e28c20970b9b09b..851e19950f8a422ab0226caf66b705dd69afe36b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java
@@ -40,9 +40,6 @@ public class AppBannerManager extends EmptyTabObserver {
     /** Pointer to the native side AppBannerManager. */
     private long mNativePointer;
 
-    /** Tab that the AppBannerView/AppBannerManager is owned by. */
-    private final Tab mTab;
-
     /**
      * Checks if app banners are enabled.
      * @return True if banners are enabled, false otherwise.
@@ -70,19 +67,18 @@ public class AppBannerManager extends EmptyTabObserver {
      */
     public AppBannerManager(Tab tab, Context context) {
         mNativePointer = nativeInit();
-        mTab = tab;
-        updatePointers();
+        updatePointers(tab);
     }
 
     @Override
     public void onWebContentsSwapped(Tab tab, boolean didStartLoad,
             boolean didFinishLoad) {
-        updatePointers();
+        updatePointers(tab);
     }
 
     @Override
     public void onContentChanged(Tab tab) {
-        updatePointers();
+        updatePointers(tab);
     }
 
     /**
@@ -96,8 +92,8 @@ public class AppBannerManager extends EmptyTabObserver {
     /**
      * Updates which WebContents the native AppBannerManager is monitoring.
      */
-    private void updatePointers() {
-        nativeReplaceWebContents(mNativePointer, mTab.getWebContents());
+    private void updatePointers(Tab tab) {
+        nativeReplaceWebContents(mNativePointer, tab.getWebContents());
     }
 
     /**