Remove the unused helper apps on OS X.

content/public/common/child_process_host.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_
 
 #include "base/files/scoped_file.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
@@ skipping 39 matching lines @@
 
 #if defined(OS_LINUX)
     // Indicates that the child execed after forking may be execced from
     // /proc/self/exe rather than using the "real" app path. This prevents
     // autoupdate from confusing us if it changes the file out from under us.
     // You will generally want to set this on Linux, except when there is an
     // override to the command line (for example, we're forking a renderer in
     // gdb). In this case, you'd use GetChildPath to get the real executable
     // file name, and then prepend the GDB command to the command line.
     CHILD_ALLOW_SELF = 1 << 0,
-#elif defined(OS_MACOSX)
-
-    // Requests that the child run in a process that does not have the
-    // PIE (position-independent executable) bit set, effectively disabling
-    // ASLR. For process types that need to allocate a large contiguous
-    // region, ASLR may not leave a large enough "hole" for the purpose. This
-    // option should be used sparingly, and only when absolutely necessary.
-    // This option is currently incompatible with CHILD_ALLOW_HEAP_EXECUTION.
-    CHILD_NO_PIE = 1 << 1,
-
-    // Requests that the child run in a process that does not protect the
-    // heap against execution. Normally, heap pages may be made executable
-    // with mprotect, so this mode should be used sparingly. It is intended
-    // for processes that may host plugins that expect an executable heap
-    // without having to call mprotect. This option is currently incompatible
-    // with CHILD_NO_PIE.
-    CHILD_ALLOW_HEAP_EXECUTION = 1 << 2,
-#endif
+#endif  // defined(OS_LINUX)
   };
 
   // Returns the pathname to be used for a child process.  If a subprocess
   // pathname was specified on the command line, that will be used.  Otherwise,
   // the default child process pathname will be returned.  On most platforms,
   // this will be the same as the currently-executing process.
   //
-  // The |flags| argument accepts one or more flags such as CHILD_ALLOW_SELF

[Mark Mentovai, 2015/08/31 17:47:42]

Don’t get rid of this entire comment, since CHILD_ALLOW_SELF (Linux) is sticking
around.

[Greg K, 2015/09/01 23:18:06]

Done.

-  // and CHILD_ALLOW_HEAP_EXECUTION as defined above. Pass only CHILD_NORMAL
-  // if none of these special behaviors are required.
-  //
   // On failure, returns an empty FilePath.
   static base::FilePath GetChildPath(int flags);
 
   // Returns an AttachmentBroker used to broker attachments of IPC messages to
   // child processes.
   static IPC::AttachmentBrokerPrivileged* GetAttachmentBroker();
 
   // Send the shutdown message to the child process.
   // Does not check with the delegate's CanShutdown.
   virtual void ForceShutdown() = 0;
@@ skipping 10 matching lines @@
 
 #if defined(OS_POSIX)
   // See IPC::Channel::TakeClientFileDescriptor.
   virtual base::ScopedFD TakeClientFileDescriptor() = 0;
 #endif
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_