Fix DumpRenderTree2 to clear AppCache between tests

import android.webkit.SslErrorHandler;

import android.webkit.WebChromeClient;

import android.webkit.WebSettings;

import android.webkit.WebStorage;

import android.webkit.WebStorage.QuotaUpdater;

import android.webkit.WebView;

import android.webkit.WebViewClient;

import android.webkit.WebStorage.QuotaUpdater;

import java.io.File;

import java.lang.Thread.UncaughtExceptionHandler;

        // This is asynchronous, but it gets processed by WebCore before it starts loading pages.

        mCurrentWebView.useMockDeviceOrientation();

        // Must do this after setting the AppCache path.

        WebStorage.getInstance().deleteAllData();

    }

    private void startTests() {