AW: Remove NetLog from AwContentBrowserClient

The NetLog is now an internal detail of the network service.
And this CL: https://chromium-review.googlesource.com/c/chromium/src/+/1695293
still left dead codes about NetLog. The CL removes it for code health.

Bug: 963875
Change-Id: I01c246b95a961b219bb4c93fd4b40743f9ba5e20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2192536
Auto-Submit: Jinsong Fan <jinsong.van@gmail.com>
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770992}

AUTHORS

@@ -466,6 +466,7 @@ Jingwei Liu <kingweiliu@gmail.com>
 Jingyi Wei <wjywbs@gmail.com>
 Jinho Bang <jinho.bang@samsung.com>
 Jinsong Fan <fanjinsong@sogou-inc.com>
+Jinsong Fan <jinsong.van@gmail.com>
 Jinwoo Song <jinwoo7.song@samsung.com>
 Jinyoung Hur <hurims@gmail.com>
 Jitendra Kumar Sahoo <jitendra.ks@samsung.com>

android_webview/browser/aw_content_browser_client.h

@@ -233,8 +233,6 @@ class AwContentBrowserClient : public content::ContentBrowserClient {
   content::SpeechRecognitionManagerDelegate*
   CreateSpeechRecognitionManagerDelegate() override;
 
-  net::NetLog* GetNonNetworkServiceNetLog();
-
   static void DisableCreatingThreadPool();
 
  private: