Track move of android.net.http.ErrorStrings.

It's now android.webkit.ErrorStrings.

Change-Id: I112ab739b0cb9bd47cee76481f5cf22d1e194b99
diff --git a/chromium/java/com/android/webview/chromium/WebViewDelegateFactory.java b/chromium/java/com/android/webview/chromium/WebViewDelegateFactory.java
index f5d1518..2bf6f14 100644
--- a/chromium/java/com/android/webview/chromium/WebViewDelegateFactory.java
+++ b/chromium/java/com/android/webview/chromium/WebViewDelegateFactory.java
@@ -1,23 +1,16 @@
 package com.android.webview.chromium;
 
-import android.app.ActivityThread;
 import android.app.Application;
 import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.res.AssetManager;
 import android.content.res.Resources;
 import android.graphics.Canvas;
-import android.net.http.ErrorStrings;
-import android.os.SystemProperties;
 import android.os.Trace;
-import android.util.Log;
 import android.util.SparseArray;
-import android.view.HardwareCanvas;
 import android.view.View;
-import android.view.ViewRootImpl;
-import android.webkit.WebViewFactory;
 
-import java.lang.reflect.InvocationTargetException;
+
 import java.lang.reflect.Method;
 
 /**