[Mac] Resolve trybot flakiness: DCHECK fail when deleting GL shader programs.

The code has other protections to ensure all programs will be eventually deleted, and only once for each time they're created.

BUG=326328
R=hclam@chromium.org

Review URL: https://codereview.chromium.org/123613005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243196 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/compositing_iosurface_shader_programs_mac.cc

@@ -358,8 +358,6 @@ void CompositingIOSurfaceShaderPrograms::Reset() {
   for (size_t i = 0; i < arraysize(shader_programs_); ++i) {
     if (shader_programs_[i] != 0u) {
       glDeleteProgram(shader_programs_[i]);
-      DCHECK(glGetError() == GL_NO_ERROR)
-          << "when calling glDeleteProgram(shader_programs_[" << i << "])";
       shader_programs_[i] = 0u;
     }
   }