Remove GL_CHROMIUM_iosurface extension

cc/test/test_web_graphics_context_3d.h

Index: cc/test/test_web_graphics_context_3d.h
diff --git a/cc/test/test_web_graphics_context_3d.h b/cc/test/test_web_graphics_context_3d.h
index 346305e17540d3d3a67fc2a3233378d21d8914ad..2c50d1f4cae2905374b536e6dea4b233f41ce1f0 100644
--- a/cc/test/test_web_graphics_context_3d.h
+++ b/cc/test/test_web_graphics_context_3d.h
@@ -270,12 +270,6 @@ class TestWebGraphicsContext3D {
                                                     GLenum usage);
   virtual void getImageivCHROMIUM(GLuint image_id, GLenum param, GLint* data);
 
-  virtual void texImageIOSurface2DCHROMIUM(GLenum target,
-                                           GLsizei width,
-                                           GLsizei height,
-                                           GLuint io_surface_id,
-                                           GLuint plane) {}
-
   virtual GLuint64 insertFenceSync();
   virtual void genSyncToken(GLuint64 fence_sync, GLbyte* sync_token);
   virtual void waitSyncToken(const GLbyte* sync_token);