[Extensions Bindings] Move request dispatch to APIRequestHandler

extensions/renderer/api_bindings_system.h

Index: extensions/renderer/api_bindings_system.h
diff --git a/extensions/renderer/api_bindings_system.h b/extensions/renderer/api_bindings_system.h
index ecea8e904774215d271e0fd71fe5df185dea906c..a21da2e1443bda3065f43decda18feb0d197de84 100644
--- a/extensions/renderer/api_bindings_system.h
+++ b/extensions/renderer/api_bindings_system.h
@@ -37,7 +37,7 @@ class APIBindingsSystem {
   APIBindingsSystem(const binding::RunJSFunction& call_js,
                     const binding::RunJSFunctionSync& call_js_sync,
                     const GetAPISchemaMethod& get_api_schema,
-                    const APIBinding::SendRequestMethod& send_request,
+                    const APIRequestHandler::SendRequestMethod& send_request,
                     const APIEventHandler::EventListenersChangedMethod&
                         event_listeners_changed,
                     APILastError last_error);
@@ -106,11 +106,6 @@ class APIBindingsSystem {
   // API. Curried in for testing purposes so we can use fake APIs.
   GetAPISchemaMethod get_api_schema_;
 
-  // The method to call when a new API call is triggered. Curried in for testing
-  // purposes. Typically, this would send an IPC to the browser to begin the
-  // function work.
-  APIBinding::SendRequestMethod send_request_;
-
   DISALLOW_COPY_AND_ASSIGN(APIBindingsSystem);
 };