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

content/shell/android/java/src/org/chromium/content_shell/Shell.java

Index: content/shell/android/java/src/org/chromium/content_shell/Shell.java
diff --git a/content/shell/android/java/src/org/chromium/content_shell/Shell.java b/content/shell/android/java/src/org/chromium/content_shell/Shell.java
index 1010c80df85ca6329d8a3f403cef64093d8d1daa..3a442a08485cd29e26478753d1391e1292efe5af 100644
--- a/content/shell/android/java/src/org/chromium/content_shell/Shell.java
+++ b/content/shell/android/java/src/org/chromium/content_shell/Shell.java
@@ -104,8 +104,6 @@ public class Shell extends LinearLayout {
     private void onNativeDestroyed() {
         mWindow = null;
         mNativeShell = 0;
-        assert !mContentView.isAttachedToWindow()
-                : "Attempting to destroy the content view while attached to the view hierarchy.";
         mContentView.destroy();
     }