[headless] Add default browser context to HeadlessBrowser.

headless/lib/browser/headless_devtools_manager_delegate.h

Index: headless/lib/browser/headless_devtools_manager_delegate.h
diff --git a/headless/lib/browser/headless_devtools_manager_delegate.h b/headless/lib/browser/headless_devtools_manager_delegate.h
index 3b800d53c1aa62abae4f19e37972064f37cd7a61..c891e8246c6cde5d7b45b26e27cd60e27d502015 100644
--- a/headless/lib/browser/headless_devtools_manager_delegate.h
+++ b/headless/lib/browser/headless_devtools_manager_delegate.h
@@ -16,7 +16,6 @@
 
 namespace headless {
 class HeadlessBrowserImpl;
-class HeadlessBrowserContext;
 
 class HeadlessDevToolsManagerDelegate
     : public content::DevToolsManagerDelegate {
@@ -32,22 +31,26 @@ class HeadlessDevToolsManagerDelegate
   std::string GetFrontendResource(const std::string& path) override;
 
  private:
-  std::unique_ptr<base::Value> CreateTarget(
+  std::unique_ptr<base::DictionaryValue> CreateTarget(
+      int command_id,
       const base::DictionaryValue* params);
-  std::unique_ptr<base::Value> CloseTarget(const base::DictionaryValue* params);
-  std::unique_ptr<base::Value> CreateBrowserContext(
+  std::unique_ptr<base::DictionaryValue> CloseTarget(
+      int command_id,
       const base::DictionaryValue* params);
-  std::unique_ptr<base::Value> DisposeBrowserContext(
+  std::unique_ptr<base::DictionaryValue> CreateBrowserContext(
+      int command_id,
+      const base::DictionaryValue* params);
+  std::unique_ptr<base::DictionaryValue> DisposeBrowserContext(
+      int command_id,
       const base::DictionaryValue* params);
 
   base::WeakPtr<HeadlessBrowserImpl> browser_;
 
-  using CommandMemberFnPtr = std::unique_ptr<base::Value> (
-      HeadlessDevToolsManagerDelegate::*)(const base::DictionaryValue* params);
+  using CommandMemberFnPtr = std::unique_ptr<base::DictionaryValue> (
+      HeadlessDevToolsManagerDelegate::*)(int command_id,
+                                          const base::DictionaryValue* params);
 
   std::map<std::string, CommandMemberFnPtr> command_map_;
-
-  HeadlessBrowserContext* default_browser_context_;
 };
 
 }  // namespace headless