Hide modal permission prompts on Android upon tab navigation/destruction

chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogDelegate.java
index 3397d3f3e8ec7f691bb4709c76fccfffcd42516a..ecdf6d87dc461c46a521f5629cbcd4f2602f1a56 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogDelegate.java
@@ -21,6 +21,9 @@ public class PermissionDialogDelegate {
     /** The native-side counterpart of this class */
     private long mNativeDelegatePtr;
 
+    /** The controller for this class */
+    private PermissionDialogController mDialogController;
+
     /** The tab for which to create the dialog. */
     private Tab mTab;
 
@@ -103,6 +106,20 @@ public class PermissionDialogDelegate {
         nativeLinkClicked(mNativeDelegatePtr);
     }
 
+    public void setDialogController(PermissionDialogController controller) {
+        mDialogController = controller;
+    }
+
+    /**
+     * Called from C++ by |nativeDelegatePtr| to destroy the dialog.
+     */
+    @CalledByNative
+    private void dismissFromNative() {
+        assert mNativeDelegatePtr != 0;
+        mNativeDelegatePtr = 0;
+        mDialogController.dismissFromNative(this);
+    }
+
     /**
      * Called from C++ by |nativeDelegatePtr| to instantiate this class.
      *