Revert "Revert 100494 - Fix bug in SimulateAttrib0."""

TEST=none
BUG=95625
TBR=apatrick@chromium.org

Review URL: http://codereview.chromium.org/7796016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@100507 0039d316-1c4b-4281-b951-d872f2087c98
void GLES2DecoderImpl::DoDisableVertexAttribArray(GLuint index) {
  if (vertex_attrib_manager_.Enable(index, false)) {
    if (index != 0 ||
        gfx::GetGLImplementation() == gfx::kGLImplementationEGLGLES2) {
      glDisableVertexAttribArray(index);
    }
  } else {
    SetGLError(GL_INVALID_VALUE,
               "glDisableVertexAttribArray: index out of range");
  }
}

void GLES2DecoderImpl::DoDisableVertexAttribArray(GLuint index) {
  if (vertex_attrib_manager_.Enable(index, false)) {
    if (index != 0 ||
        gfx::GetGLImplementation() == gfx::kGLImplementationEGLGLES2) {
      glDisableVertexAttribArray(index);
    }
  } else {
    SetGLError(GL_INVALID_VALUE,
               "glDisableVertexAttribArray: index out of range");
  }
}
