Remove InsecureContentInfobarDelegate, which has been broken for a while

components/content_settings/content/common/content_settings_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.
 
 // Multiply-included file, no traditional include guard.
 #include "base/strings/string16.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "ipc/ipc_message_macros.h"
 #include "url/gurl.h"
 #include "url/ipc/url_param_traits.h"
 
 #define IPC_MESSAGE_START ContentSettingsMsgStart
 
 IPC_ENUM_TRAITS_MAX_VALUE(ContentSettingsType,
                           CONTENT_SETTINGS_NUM_TYPES_DO_NOT_USE - 1)
 
 //-----------------------------------------------------------------------------
 // These are messages sent from the browser to the renderer process.
 
-// Sent in response to FrameHostMsg_DidBlockDisplayingInsecureContent.
-IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetAllowDisplayingInsecureContent,
-                    bool /* allowed */)
-
 // Sent in response to FrameHostMsg_DidBlockRunningInsecureContent.
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetAllowRunningInsecureContent,
                     bool /* allowed */)
 
 IPC_MESSAGE_ROUTED0(ChromeViewMsg_ReloadFrame)
 
 // Tells the renderer whether or not a file system access has been allowed.
 IPC_MESSAGE_ROUTED2(ChromeViewMsg_RequestFileSystemAccessAsyncResponse,
                     int  /* request_id */,
                     bool /* allowed */)
@@ skipping 53 matching lines @@
 IPC_SYNC_MESSAGE_CONTROL4_1(ChromeViewHostMsg_AllowIndexedDB,
                             int /* render_frame_id */,
                             GURL /* origin_url */,
                             GURL /* top origin url */,
                             base::string16 /* database name */,
                             bool /* allowed */)
 
 // Sent when the renderer was prevented from displaying insecure content in
 // a secure page by a security policy.  The page may appear incomplete.
 IPC_MESSAGE_ROUTED0(ChromeViewHostMsg_DidBlockDisplayingInsecureContent)