WebView: Refactor PlatformServiceBridge.getInstance

android_webview/java/src/org/chromium/android_webview/AwMetricsLogUploader.java

 // Copyright 2017 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.android_webview;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 
 /**
  * Passes UMA logs from native to PlatformServiceBridge.
  */
 @JNINamespace("android_webview")
 public class AwMetricsLogUploader {
     @CalledByNative
     public static void uploadLog(byte[] data) {
-        // getInstance only needs a Context on the first call. WebViewChromiumFactoryProvider will
-        // have already called it, so we can pass null here.
-        PlatformServiceBridge.getInstance(null).logMetrics(data);
+        PlatformServiceBridge.getInstance().logMetrics(data);
     }
 }