Revert of Signal extension API schema corruption to the browser process.

extensions/common/extension_messages.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 813 matching lines @@
 // Sent by the renderer when it has received a Blob handle from the browser.
 IPC_MESSAGE_CONTROL1(ExtensionHostMsg_TransferBlobsAck,
                      std::vector<std::string> /* blob_uuids */)
 
 // Asks the browser to wake the event page of an extension.
 // The browser will reply with ExtensionHostMsg_WakeEventPageResponse.
 IPC_MESSAGE_CONTROL2(ExtensionHostMsg_WakeEventPage,
                      int /* request_id */,
                      std::string /* extension_id */)
 
-// Notifies the browser that the specified extension API schema could not be
-// parsed.
-IPC_MESSAGE_CONTROL1(ExtensionHostMsg_NotifyBadExtensionApiSchema,
-                     std::string /* api */)
-
 // Tells listeners that a detailed message was reported to the console by
 // WebKit.
 IPC_MESSAGE_ROUTED4(ExtensionHostMsg_DetailedConsoleMessageAdded,
                     base::string16 /* message */,
                     base::string16 /* source */,
                     extensions::StackTrace /* stack trace */,
                     int32_t /* severity level */)
 
 // Sent when a query selector request is made from the automation API.
 // acc_obj_id is the accessibility tree ID of the starting element.
@@ skipping 26 matching lines @@
 
 // The browser sends this message in response to all service worker extension
 // api calls. The response data (if any) is one of the base::Value subclasses,
 // wrapped as the first element in a ListValue.
 IPC_MESSAGE_CONTROL5(ExtensionMsg_ResponseWorker,
                      int /* thread_id */,
                      int /* request_id */,
                      bool /* success */,
                      base::ListValue /* response wrapper (see comment above) */,
                      std::string /* error */)