Fix compilation error on OS X.

atom/app/atom_main_delegate.cc

@@ -10,11 +10,11 @@
 #include "atom/browser/atom_browser_client.h"
 #include "atom/common/google_api_key.h"
 #include "atom/renderer/atom_renderer_client.h"
+#include "atom/utility/atom_content_utility_client.h"
 #include "base/command_line.h"
 #include "base/debug/stack_trace.h"
 #include "base/environment.h"
 #include "base/logging.h"
-#include "chrome/utility/chrome_content_utility_client.h"
 #include "content/public/common/content_switches.h"
 #include "ui/base/resource/resource_bundle.h"
 
@@ -96,10 +96,8 @@ content::ContentRendererClient*
 }
 
 content::ContentUtilityClient* AtomMainDelegate::CreateContentUtilityClient() {
-#if defined(OS_WIN)
   utility_client_.reset(new AtomContentUtilityClient);
   return utility_client_.get();
-#endif
 }
 
 scoped_ptr<brightray::ContentClient> AtomMainDelegate::CreateContentClient() {

atom/utility/atom_content_utility_client.cc

@@ -27,10 +27,6 @@ bool Send(IPC::Message* message) {
   return content::UtilityThread::Get()->Send(message);
 }
 
-void ReleaseProcessIfNeeded() {
-  content::UtilityThread::Get()->ReleaseProcessIfNeeded();
-}
-
 }  // namespace
 
 namespace atom {
@@ -40,7 +36,9 @@ int64_t AtomContentUtilityClient::max_ipc_message_size_ =
 
 AtomContentUtilityClient::AtomContentUtilityClient()
     : filter_messages_(false) {
+#if defined(OS_WIN)
   handlers_.push_back(new PrintingHandler());
+#endif
 }
 
 AtomContentUtilityClient::~AtomContentUtilityClient() {