[Android] Remove assert as it uses a non-API backwards compatible function.

content/shell/android/java/src/org/chromium/content_shell/Shell.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_shell;
 
 import android.content.Context;
 import android.graphics.drawable.ClipDrawable;
 import android.text.TextUtils;
 import android.util.AttributeSet;
@@ skipping 86 matching lines @@
      */
     public void close() {
         if (mNativeShell == 0) return;
         nativeCloseShell(mNativeShell);
     }
 
     @CalledByNative
     private void onNativeDestroyed() {
         mWindow = null;
         mNativeShell = 0;
-        assert !mContentView.isAttachedToWindow()
-                : "Attempting to destroy the content view while attached to the view hierarchy.";
         mContentView.destroy();
     }
 
     /**
      * @return Whether the Shell has been destroyed.
      * @see #onNativeDestroyed()
      */
     public boolean isDestroyed() {
         return mNativeShell == 0;
     }
@@ skipping 150 matching lines @@
                 Context.INPUT_METHOD_SERVICE);
         if (visible) {
             imm.showSoftInput(mUrlTextView, InputMethodManager.SHOW_IMPLICIT);
         } else {
             imm.hideSoftInputFromWindow(mUrlTextView.getWindowToken(), 0);
         }
     }
 
     private static native void nativeCloseShell(long shellPtr);
 }