[headless] Remove default browser context.

headless/lib/browser/headless_web_contents_impl.h

Index: headless/lib/browser/headless_web_contents_impl.h
diff --git a/headless/lib/browser/headless_web_contents_impl.h b/headless/lib/browser/headless_web_contents_impl.h
index 9c335ee20636994f7300b62598548647d10bf32f..4aca28c81662feded60f1b98344a9170252c0e65 100644
--- a/headless/lib/browser/headless_web_contents_impl.h
+++ b/headless/lib/browser/headless_web_contents_impl.h
@@ -5,13 +5,15 @@
 #ifndef HEADLESS_LIB_BROWSER_HEADLESS_WEB_CONTENTS_IMPL_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_WEB_CONTENTS_IMPL_H_
 
+#include <list>
+#include <memory>
+#include <string>
+#include <unordered_map>
+
 #include "content/public/browser/web_contents_observer.h"
 #include "headless/public/headless_devtools_target.h"
 #include "headless/public/headless_web_contents.h"
 
-#include <memory>
-#include <unordered_map>
-
 namespace aura {
 class Window;
 }
@@ -41,13 +43,12 @@ class HeadlessWebContentsImpl : public HeadlessWebContents,
 
   static std::unique_ptr<HeadlessWebContentsImpl> Create(
       HeadlessWebContents::Builder* builder,
-      aura::Window* parent_window,
-      HeadlessBrowserImpl* browser);
+      aura::Window* parent_window);
 
   // Takes ownership of |web_contents|.
   static std::unique_ptr<HeadlessWebContentsImpl> CreateFromWebContents(
       content::WebContents* web_contents,
-      HeadlessBrowserImpl* browser);
+      HeadlessBrowserContextImpl* browser_context);
 
   // HeadlessWebContents implementation:
   void AddObserver(Observer* observer) override;
@@ -68,10 +69,13 @@ class HeadlessWebContentsImpl : public HeadlessWebContents,
 
   std::string GetDevtoolsAgentHostId();
 
+  HeadlessBrowserImpl* browser() const;
+  HeadlessBrowserContextImpl* browser_context() const;
+
  private:
   // Takes ownership of |web_contents|.
   HeadlessWebContentsImpl(content::WebContents* web_contents,
-                          HeadlessBrowserImpl* browser);
+                          HeadlessBrowserContextImpl* browser_context);
 
   void InitializeScreen(aura::Window* parent_window,
                         const gfx::Size& initial_size);
@@ -84,7 +88,7 @@ class HeadlessWebContentsImpl : public HeadlessWebContents,
   scoped_refptr<content::DevToolsAgentHost> agent_host_;
   std::list<MojoService> mojo_services_;
 
-  HeadlessBrowserImpl* browser_;  // Not owned.
+  HeadlessBrowserContextImpl* browser_context_;  // Not owned.
 
   using ObserverMap =
       std::unordered_map<HeadlessWebContents::Observer*,