mac: Remove InitWebCoreSystemInterface() calls from many random places.

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 59a6c63674604b586cdf04f7494e504c9d5a47d5..bd443bf3c46633e65dabb2d2fdcf963494e1e0d4 100644
--- a/content/renderer/renderer_main_platform_delegate_mac.mm
+++ b/content/renderer/renderer_main_platform_delegate_mac.mm
@@ -14,7 +14,6 @@
 #include "content/common/sandbox_mac.h"
 #include "content/public/common/content_switches.h"
 #include "content/common/sandbox_init_mac.h"
-#include "third_party/WebKit/Source/WebKit/mac/WebCoreSupport/WebSystemInterface.h"
 
 RendererMainPlatformDelegate::RendererMainPlatformDelegate(
     const content::MainFunctionParams& parameters)
@@ -32,9 +31,6 @@ void RendererMainPlatformDelegate::PlatformInitialize() {
   // native UI elements (e.g. buttons) in WebKit will explode.
   [NSApplication sharedApplication];
 
-  // Load WebKit system interfaces.
-  InitWebCoreSystemInterface();
-
   if (![NSThread isMultiThreaded]) {
     NSString* string = @"";
     [NSThread detachNewThreadSelector:@selector(length)