Remove VirtualGLApi

ui/gl/gl_gl_api_implementation.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 UI_GL_GL_GL_API_IMPLEMENTATION_H_
 #define UI_GL_GL_GL_API_IMPLEMENTATION_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 52 matching lines @@
   void InitializeWithCommandLine(DriverGL* driver,
                                  base::CommandLine* command_line);
 
   void glGetIntegervFn(GLenum pname, GLint* params) override;
   const GLubyte* glGetStringFn(GLenum name) override;
   const GLubyte* glGetStringiFn(GLenum name, GLuint index) override;
 
   void InitializeFilteredExtensions();
 
  private:
-  void glFinishFn() override;
-  void glFlushFn() override;
-
   // Filtered GL_EXTENSIONS we return to glGetString(i) calls.
   std::vector<std::string> disabled_exts_;
   std::vector<std::string> filtered_exts_;
   std::string filtered_exts_str_;
 
 #if DCHECK_IS_ON()
   bool filtered_exts_initialized_;
 #endif
 };
 
@@ skipping 17 matching lines @@
  public:
   NoContextGLApi();
   ~NoContextGLApi() override;
 
   // Include the auto-generated part of this class. We split this because
   // it means we can easily edit the non-auto generated parts right here in
   // this file instead of having to edit some template or the code generator.
   #include "gl_bindings_api_autogen_gl.h"
 };
 
-// Implementents the GL API using co-operative state restoring.
-// Assumes there is only one real GL context and that multiple virtual contexts
-// are implemented above it. Restores the needed state from the current context.
-class VirtualGLApi : public GLApiBase {
- public:
-  VirtualGLApi();
-  ~VirtualGLApi() override;
-  void Initialize(DriverGL* driver, GLContext* real_context);
-
-  // Sets the current virutal context.
-  bool MakeCurrent(GLContext* virtual_context, GLSurface* surface);
-
-  void OnReleaseVirtuallyCurrent(GLContext* virtual_context);
-
- private:
-  // Overridden functions from GLApiBase
-  void glGetIntegervFn(GLenum pname, GLint* params) override;
-  const GLubyte* glGetStringFn(GLenum name) override;
-  const GLubyte* glGetStringiFn(GLenum name, GLuint index) override;
-  void glFinishFn() override;
-  void glFlushFn() override;
-
-  // The real context we're running on.
-  GLContext* real_context_;
-
-  // The current virtual context.
-  GLContext* current_context_;
-
-  // The supported extensions being advertised for this virtual context.
-  std::string extensions_;
-  std::vector<std::string> extensions_vec_;
-};
-
 }  // namespace gl
 
 #endif  // UI_GL_GL_GL_API_IMPLEMENTATION_H_