Implement PluginsPermissionContext and hookup to flash download interception.

chrome/browser/plugins/flash_permission_context.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_PLUGINS_FLASH_PERMISSION_CONTEXT_H_
 #define CHROME_BROWSER_PLUGINS_FLASH_PERMISSION_CONTEXT_H_
 
 #include "base/macros.h"
 #include "chrome/browser/permissions/permission_context_base.h"
 
+class GURL;
+class PermissionRequestID;
+
 class FlashPermissionContext : public PermissionContextBase {
  public:
   explicit FlashPermissionContext(Profile* profile);
   ~FlashPermissionContext() override;
 
  private:
   // PermissionContextBase:
+  ContentSetting GetPermissionStatus(
+      const GURL& requesting_origin,
+      const GURL& embedding_origin) const override;
+  void UpdateTabContext(const PermissionRequestID& id,
+                        const GURL& requesting_origin,
+                        bool allowed) override;
   bool IsRestrictedToSecureOrigins() const override;
 
   DISALLOW_COPY_AND_ASSIGN(FlashPermissionContext);
 };
 
 #endif  // CHROME_BROWSER_PLUGINS_FLASH_PERMISSION_CONTEXT_H_