De-classicify Browser

Removes the hard run-time dependency on WebViewClassic.
(Still needs visisbility of it to build though)
This is needed to enable chromium webview testing.

Change-Id: I290b6b23b2eac525537ebc3ef8007d681a67a169
diff --git a/src/com/android/browser/BaseUi.java b/src/com/android/browser/BaseUi.java
index b766fb9..3ba3182 100644
--- a/src/com/android/browser/BaseUi.java
+++ b/src/com/android/browser/BaseUi.java
@@ -423,9 +423,9 @@
                 .findViewById(R.id.subwindow_close);
         final WebView cancelSubView = subView;
         cancel.setOnClickListener(new OnClickListener() {
+            @Override
             public void onClick(View v) {
-                WebViewClassic.fromWebView(cancelSubView).getWebChromeClient().onCloseWindow(
-                        cancelSubView);
+                ((BrowserWebView) cancelSubView).getWebChromeClient().onCloseWindow(cancelSubView);
             }
         });
         tab.setSubWebView(subView);