[headless] Remove default browser context.

headless/public/headless_browser.cc

Index: headless/public/headless_browser.cc
diff --git a/headless/public/headless_browser.cc b/headless/public/headless_browser.cc
index bbc644b231cf9e37499e42661f8708a51aaa6cd8..44eb0833bd2c742e5ef73c5366142b5dea1fb8c5 100644
--- a/headless/public/headless_browser.cc
+++ b/headless/public/headless_browser.cc
@@ -2,9 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/public/common/user_agent.h"
 #include "headless/public/headless_browser.h"
 
+#include <utility>
+
+#include "content/public/common/user_agent.h"
+
 using Options = headless::HeadlessBrowser::Options;
 using Builder = headless::HeadlessBrowser::Options::Builder;
 
@@ -71,13 +74,13 @@ Builder& Builder::SetDisableSandbox(bool disable_sandbox) {
   return *this;
 }
 
-Builder& Builder::SetProtocolHandlers(ProtocolHandlerMap protocol_handlers) {
-  options_.protocol_handlers = std::move(protocol_handlers);
+Builder& Builder::SetGLImplementation(const std::string& gl_implementation) {
+  options_.gl_implementation = gl_implementation;
   return *this;
 }
 
-Builder& Builder::SetGLImplementation(const std::string& gl_implementation) {
-  options_.gl_implementation = gl_implementation;
+Builder& Builder::SetUserDataDir(const base::FilePath& user_data_dir) {
+  options_.user_data_dir = user_data_dir;
   return *this;
 }