Revert of Have each SandboxedProcessLauncherDelegate maintain a zygote.

content/public/common/sandboxed_process_launcher_delegate.h

Index: content/public/common/sandboxed_process_launcher_delegate.h
diff --git a/content/public/common/sandboxed_process_launcher_delegate.h b/content/public/common/sandboxed_process_launcher_delegate.h
index 9dfcb3267c034a12a7b02c544c57db449778804c..a3aa4e06426534344883bdab2be7fe60536a296d 100644
--- a/content/public/common/sandboxed_process_launcher_delegate.h
+++ b/content/public/common/sandboxed_process_launcher_delegate.h
@@ -5,15 +5,12 @@
 #ifndef CONTENT_PUBLIC_COMMON_SANDBOXED_PROCESS_LAUNCHER_DELEGATE_H_
 #define CONTENT_PUBLIC_COMMON_SANDBOXED_PROCESS_LAUNCHER_DELEGATE_H_
 
-#include <cstddef>
-
 #include "base/environment.h"
 #include "base/files/scoped_file.h"
 #include "base/process/process.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/public/common/sandbox_type.h"
-#include "content/public/common/zygote_handle.h"
 
 namespace base {
 class FilePath;
@@ -54,10 +51,8 @@
   virtual void PostSpawnTarget(base::ProcessHandle process) {}
 
 #elif defined(OS_POSIX)
-#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
   // Override this to return true to use the setuid sandbox.
-  virtual ZygoteHandle* GetZygote();
-#endif  // !defined(OS_MACOSX) && !defined(OS_ANDROID)
+  virtual bool ShouldUseZygote();
 
   // Override this if the process needs a non-empty environment map.
   virtual base::EnvironmentMap GetEnvironment();