Remove WorkerPool dependency from URLRequestFileJob.

sync/test/accounts_client/url_request_context_getter.cc

Index: sync/test/accounts_client/url_request_context_getter.cc
diff --git a/sync/test/accounts_client/url_request_context_getter.cc b/sync/test/accounts_client/url_request_context_getter.cc
index 161b57d0655860f2c2fb54f1ae1b08dd8fb09e01..ba34e0dc82fc867537b6c2b98eba6c7852f4f29e 100644
--- a/sync/test/accounts_client/url_request_context_getter.cc
+++ b/sync/test/accounts_client/url_request_context_getter.cc
@@ -6,6 +6,7 @@
 
 #include <string>
 
+#include "base/threading/worker_pool.h"
 #include "net/proxy/proxy_config_service.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_builder.h"
@@ -35,7 +36,8 @@ URLRequestContextGetter::URLRequestContextGetter(
 net::URLRequestContext* URLRequestContextGetter::GetURLRequestContext() {
   CHECK(network_task_runner_->BelongsToCurrentThread());
   if (!url_request_context_) {
-    net::URLRequestContextBuilder builder;
+    net::URLRequestContextBuilder builder(
+        base::WorkerPool::GetTaskRunner(true /* task_is_slow */));
     // net::HttpServer fails to parse headers if user-agent header is blank.
     builder.set_user_agent("sync-test-accounts-client");
     builder.DisableHttpCache();