Revert of [Mac] Shut down connections to WindowServer before engaging the...

Revert of [Mac] Shut down connections to WindowServer before engaging the sandbox. (patchset #1 id:1 of https://codereview.chromium.org/545603002/)

Reason for revert:
Speculative revert: seems this change caused 135 layout tests failures on the webkit mac builders, from OSX 10.6-10.9

http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.6%20%28deps%29/builds/30830

Original issue's description:
> [Mac] Shut down connections to WindowServer before engaging the sandbox.
>
> The connection is only needed during sandbox warmup to initialize the default
> color space. It was formerly needed by scrollbar NSAnimations, but that was
> replaced via https://codereview.chromium.org/529103002/.
>
> BUG=397642,306348
> TEST=Manually tested on 10.6-10.10.
> R=avi@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/d9707172e540487d14c53363c5d1c2151999c2d8

TBR=avi@chromium.org,rsesek@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=397642,306348

Review URL: https://codereview.chromium.org/550763002

Cr-Commit-Position: refs/heads/master@{#293653}

content/renderer/renderer_main_platform_delegate_mac.mm

@@ -18,11 +18,6 @@
 #include "content/public/common/content_switches.h"
 #include "content/common/sandbox_init_mac.h"
 
-extern "C" {
-void CGSSetDenyWindowServerConnections(bool);
-void CGSShutdownServerConnections();
-};
-
 namespace content {
 
 namespace {
@@ -141,12 +136,6 @@ void RendererMainPlatformDelegate::PlatformUninitialize() {
 }
 
 bool RendererMainPlatformDelegate::EnableSandbox() {
-  // Disconnect from WindowServer before entering the sandbox, after all
-  // objects have been warmed up. Shutting down the connection requires
-  // connecting to WindowServer, so do this before engaging the sandbox.
-  CGSSetDenyWindowServerConnections(true);
-  CGSShutdownServerConnections();
-
   // Enable the sandbox.
   bool sandbox_initialized = InitializeSandbox();