Revert "Add a requiresVertexShader method to GrGLEffect"

This reverts commit 1a30a3af805b7ea688d4a0f0bfe373c204085a27. We're
going to take a different direction for vertexless shaders.

R=bsalomon@google.com

Author: cdalton@nvidia.com

Review URL: https://codereview.chromium.org/23464082

git-svn-id: http://skia.googlecode.com/svn/trunk@11521 2bbb7eff-a529-9590-31e7-b0007b416f81
11 files changed