Remove NPAPI support for form data

content/renderer/npapi/webplugin_delegate_proxy.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_NPAPI_WEBPLUGIN_DELEGATE_PROXY_H_
 #define CONTENT_RENDERER_NPAPI_WEBPLUGIN_DELEGATE_PROXY_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 50 matching lines @@
 
   // WebPluginDelegate implementation:
   void PluginDestroyed() override;
   bool Initialize(const GURL& url,
                   const std::vector<std::string>& arg_names,
                   const std::vector<std::string>& arg_values,
                   bool load_manually) override;
   void UpdateGeometry(const gfx::Rect& window_rect,
                       const gfx::Rect& clip_rect) override;
   void Paint(SkCanvas* canvas, const gfx::Rect& rect) override;
-  bool GetFormValue(base::string16* value) override;
   void SetFocus(bool focused) override;
   bool HandleInputEvent(const blink::WebInputEvent& event,
                         WebCursor::CursorInfo* cursor) override;
   int GetProcessId() override;
 
   // Informs the plugin that its containing content view has gained or lost
   // first responder status.
   virtual void SetContentAreaFocus(bool has_focus);
 #if defined(OS_MACOSX)
   // Informs the plugin that its enclosing window has gained or lost focus.
@@ skipping 153 matching lines @@
 
   // The url of the main frame hosting the plugin.
   GURL page_url_;
 
   DISALLOW_COPY_AND_ASSIGN(WebPluginDelegateProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_NPAPI_WEBPLUGIN_DELEGATE_PROXY_H_