Use TaskRunner passed in to URLRequestContextBuilder only for the cache

android_webview/browser/net/aw_url_request_context_getter.cc

Index: android_webview/browser/net/aw_url_request_context_getter.cc
diff --git a/android_webview/browser/net/aw_url_request_context_getter.cc b/android_webview/browser/net/aw_url_request_context_getter.cc
index de485349e3d962bbc30f93ddec6ea5ca7026485c..f8a2ec6a27fe38c32debf339f3bdfc661b73a6a2 100644
--- a/android_webview/browser/net/aw_url_request_context_getter.cc
+++ b/android_webview/browser/net/aw_url_request_context_getter.cc
@@ -254,7 +254,7 @@ void AwURLRequestContextGetter::InitializeURLRequestContext() {
   cache_params.max_size = 20 * 1024 * 1024;  // 20M
   cache_params.path = cache_path_;
   builder.EnableHttpCache(cache_params);
-  builder.SetFileTaskRunner(
+  builder.SetCacheThreadTaskRunner(
       BrowserThread::GetTaskRunnerForThread(BrowserThread::CACHE));
 
   net::HttpNetworkSession::Params network_session_params;