Migrate ResourceExtractor.java inside org.chromium.base package.

content/public/android/java/src/org/chromium/content/browser/BrowserStartupController.java

 // Copyright 2013 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.browser;
 
 import android.content.Context;
 import android.os.Handler;
 import android.util.Log;
 
 import com.google.common.annotations.VisibleForTesting;
 
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
+import org.chromium.base.ResourceExtractor;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.library_loader.LibraryLoader;
 import org.chromium.base.library_loader.LoaderErrors;
 import org.chromium.base.library_loader.ProcessInitException;
 import org.chromium.content.app.ContentMain;
 
 import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ skipping 261 matching lines @@
 
     private static native void nativeSetCommandLineFlags(
             boolean singleProcess, String pluginDescriptor);
 
     // Is this an official build of Chrome? Only native code knows for sure. Official build
     // knowledge is needed very early in process startup.
     private static native boolean nativeIsOfficialBuild();
 
     private static native boolean nativeIsPluginEnabled();
 }