Switch SkyShell to its own ResourceExtractor

sky/shell/android/org/domokit/sky/shell/SkyMain.java

Index: sky/shell/android/org/domokit/sky/shell/SkyMain.java
diff --git a/sky/shell/android/org/domokit/sky/shell/SkyMain.java b/sky/shell/android/org/domokit/sky/shell/SkyMain.java
index 9966979384d79353700153a9f209ee760cb69989..3150f4c6ee5bb93ab30c8c3de6504eb7a5cfeac8 100644
--- a/sky/shell/android/org/domokit/sky/shell/SkyMain.java
+++ b/sky/shell/android/org/domokit/sky/shell/SkyMain.java
@@ -8,7 +8,6 @@ import android.content.Context;
 import android.util.Log;
 
 import org.chromium.base.JNINamespace;
-import org.chromium.base.ResourceExtractor;
 
 /**
  * A class to intialize the native code.
@@ -30,9 +29,8 @@ public class SkyMain {
             return;
         }
         try {
-            ResourceExtractor resourceExtractor = ResourceExtractor.get(applicationContext);
-            resourceExtractor.startExtractingResources();
-            resourceExtractor.waitForCompletion();
+            SkyApplication app = (SkyApplication) applicationContext;
+            app.getResourceExtractor().waitForCompletion();
             nativeInit(applicationContext);
             sInitialized = true;
         } catch (Exception e) {