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

content/browser/renderer_host/compositing_iosurface_shader_programs_mac.cc

Index: content/browser/renderer_host/compositing_iosurface_shader_programs_mac.cc
diff --git a/content/browser/renderer_host/compositing_iosurface_shader_programs_mac.cc b/content/browser/renderer_host/compositing_iosurface_shader_programs_mac.cc
index 87f0f341be2c532856b888f4d6dd6703d8ce2617..753c180dbf5466eaed5bf30cb76c821318f8ee13 100644
--- a/content/browser/renderer_host/compositing_iosurface_shader_programs_mac.cc
+++ b/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;
     }
   }