headless: Allow per-context protocol handlers

headless/public/headless_browser.h

Index: headless/public/headless_browser.h
diff --git a/headless/public/headless_browser.h b/headless/public/headless_browser.h
index 1711dc0da2df3d5056c8c54f94e5761872d3477d..2e9145153aecb42a4f126481436003fb8e0a6cbe 100644
--- a/headless/public/headless_browser.h
+++ b/headless/public/headless_browser.h
@@ -18,7 +18,6 @@
 #include "headless/public/headless_web_contents.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/ip_endpoint.h"
-#include "net/url_request/url_request_job_factory.h"
 
 namespace base {
 class MessagePump;
@@ -73,10 +72,6 @@ class HEADLESS_EXPORT HeadlessBrowser {
   DISALLOW_COPY_AND_ASSIGN(HeadlessBrowser);
 };
 
-using ProtocolHandlerMap = std::unordered_map<
-    std::string,
-    std::unique_ptr<net::URLRequestJobFactory::ProtocolHandler>>;
-
 // Embedding API overrides for the headless browser.
 struct HeadlessBrowser::Options {
   class Builder;