Remove PixelStorei calls that are no longer necessary.

Source/platform/graphics/GraphicsTypes3D.h

Index: Source/platform/graphics/GraphicsTypes3D.h
diff --git a/Source/platform/graphics/GraphicsTypes3D.h b/Source/platform/graphics/GraphicsTypes3D.h
index 454889352252f3e672b650e726ecaa5bb5253921..cbddeb80c21e4d7476ce77a7159723d1f321e342 100644
--- a/Source/platform/graphics/GraphicsTypes3D.h
+++ b/Source/platform/graphics/GraphicsTypes3D.h
@@ -44,13 +44,6 @@ const unsigned GC3D_UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243;
 const unsigned GC3D_BROWSER_DEFAULT_WEBGL = 0x9244;
 const unsigned GC3D_MAX_CLIENT_WAIT_TIMEOUT_WEBGL = 0x9247;
 
-// GL_CHROMIUM_flipy
-const unsigned GC3D_UNPACK_FLIP_Y_CHROMIUM = 0x9240;
-
-// GL_CHROMIUM_copy_texture
-const unsigned GC3D_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM = 0x9241;
-const unsigned GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM = 0x9242;
-
 // GL_AMD_compressed_ATC_texture
 const unsigned GC3D_COMPRESSED_ATC_RGB_AMD = 0x8C92;
 const unsigned GC3D_COMPRESSED_ATC_RGBA_EXPLICIT_ALPHA_AMD = 0x8C93;