Fix (or tag) uses of explicit '64' instead of GL_MAILBOX_SIZE_CHROMIUM

content/browser/gpu/gpu_process_host_ui_shim.cc

Index: content/browser/gpu/gpu_process_host_ui_shim.cc
diff --git a/content/browser/gpu/gpu_process_host_ui_shim.cc b/content/browser/gpu/gpu_process_host_ui_shim.cc
index ec62dff46bc8869821cf3ea9355d209fe2a5f0e7..076f6771eef3b09f9d3c7d92abdd62edbf7a2fb1 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.cc
+++ b/content/browser/gpu/gpu_process_host_ui_shim.cc
@@ -22,11 +22,6 @@
 #include "content/public/browser/browser_thread.h"
 #include "ui/gl/gl_switches.h"
 
-// From gl2/gl2ext.h.
-#ifndef GL_MAILBOX_SIZE_CHROMIUM
-#define GL_MAILBOX_SIZE_CHROMIUM 64
-#endif
-
 namespace content {
 
 namespace {