DevTools: merge devtools_http_handler into content - it is used in all the embedders anyways.

headless/lib/browser/headless_devtools_manager_delegate.cc

Index: headless/lib/browser/headless_devtools_manager_delegate.cc
diff --git a/headless/lib/browser/headless_devtools_manager_delegate.cc b/headless/lib/browser/headless_devtools_manager_delegate.cc
index ce89824097031edb287f2b3faaad3e99253bcf50..b62fd1e31e3c798340aec658b7bfaa7b731db62c 100644
--- a/headless/lib/browser/headless_devtools_manager_delegate.cc
+++ b/headless/lib/browser/headless_devtools_manager_delegate.cc
@@ -77,6 +77,16 @@ HeadlessDevToolsManagerDelegate::CreateNewTarget(const GURL& url) {
   return nullptr;
 }
 
+std::string HeadlessDevToolsManagerDelegate::GetDiscoveryPageHTML() {
+  return ResourceBundle::GetSharedInstance().GetRawDataResource(
+      IDR_HEADLESS_LIB_DEVTOOLS_DISCOVERY_PAGE).as_string();
+}
+
+std::string HeadlessDevToolsManagerDelegate::GetFrontendResource(
+    const std::string& path) {
+  return content::DevToolsFrontendHost::GetFrontendResource(path).as_string();
+}
+
 std::unique_ptr<base::Value> HeadlessDevToolsManagerDelegate::CreateTarget(
     const base::DictionaryValue* params) {
   std::string url;