[Mac] Remove NSScreen renderer sandbox warmup.

content/renderer/renderer_main_platform_delegate_mac.mm

Index: content/renderer/renderer_main_platform_delegate_mac.mm
diff --git a/content/renderer/renderer_main_platform_delegate_mac.mm b/content/renderer/renderer_main_platform_delegate_mac.mm
index 8215ca414a9f0d5f2f47660d9ab5e0b2fbdc2cd4..c890040b81f38e1064b0cdb89a7396f96a08bed9 100644
--- a/content/renderer/renderer_main_platform_delegate_mac.mm
+++ b/content/renderer/renderer_main_platform_delegate_mac.mm
@@ -116,13 +116,6 @@ RendererMainPlatformDelegate::~RendererMainPlatformDelegate() {
 // running a renderer needs to also be reflected in chrome_main.cc for
 // --single-process support.
 void RendererMainPlatformDelegate::PlatformInitialize() {
-  if (base::mac::IsAtLeastOS10_10()) {
-    // This is needed by the NSAnimations run for the scrollbars. If we switch
-    // from native scrollers to drawing them in some other way, this warmup can
-    // be removed <http://crbug.com/306348>.
-    [NSScreen screens];
-  }
-
   if (![NSThread isMultiThreaded]) {
     NSString* string = @"";
     [NSThread detachNewThreadSelector:@selector(length)