Disable the seccomp filter GPU process sandbox by default on Chrome OS.

content/gpu/gpu_main.cc

Index: content/gpu/gpu_main.cc
diff --git a/content/gpu/gpu_main.cc b/content/gpu/gpu_main.cc
index 27caaa0bbdadb780813b0e71778b1279816180ce..ca53d5f3e6d4af654b39e9408828b99ee9d7025b 100644
--- a/content/gpu/gpu_main.cc
+++ b/content/gpu/gpu_main.cc
@@ -139,7 +139,7 @@ int GpuMain(const content::MainFunctionParams& parameters) {
     (void) ret;
   }
 
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+#if defined(OS_LINUX)
   {
     TRACE_EVENT0("gpu", "Initialize sandbox");
     content::InitializeSandbox();