DevTools: prepare to migrate worker ids from ints to strings.

BUG=463892
TBR=dgozman

Review URL: https://codereview.chromium.org/979793002

Cr-Commit-Position: refs/heads/master@{#319063}

content/browser/devtools/protocol/worker_handler.cc

@@ -24,6 +24,10 @@ Response WorkerHandler::DisconnectFromWorker(int worker_id) {
   return Response::FallThrough();
 }
 
+Response WorkerHandler::DisconnectFromWorker(const std::string& worker_id) {
+  return Response::FallThrough();
+}
+
 }  // namespace worker
 }  // namespace devtools
 }  // namespace content

content/browser/devtools/protocol/worker_handler.h

@@ -22,6 +22,8 @@ class WorkerHandler {
 
   Response DisconnectFromWorker(int worker_id);
 
+  Response DisconnectFromWorker(const std::string& worker_id);
+
  private:
   scoped_ptr<Client> client_;