Get rid of all pid references from base::SharedMemoryHandle.

mojo/public/cpp/system/platform_handle.cc

Index: mojo/public/cpp/system/platform_handle.cc
diff --git a/mojo/public/cpp/system/platform_handle.cc b/mojo/public/cpp/system/platform_handle.cc
index 63c8c1406ec54d26ffe2d04d20b386df0a4edf6b..7cedb3ac85684fe4fdbd24d5dfa885131688bf4d 100644
--- a/mojo/public/cpp/system/platform_handle.cc
+++ b/mojo/public/cpp/system/platform_handle.cc
@@ -117,17 +117,15 @@ MojoResult UnwrapSharedMemoryHandle(ScopedSharedBufferHandle handle,
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   CHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_MACH_PORT);
   *memory_handle = base::SharedMemoryHandle(
-      static_cast<mach_port_t>(platform_handle.value), num_bytes,
-      base::GetCurrentProcId());
+      static_cast<mach_port_t>(platform_handle.value), num_bytes);
 #elif defined(OS_POSIX)
   CHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_FILE_DESCRIPTOR);
   *memory_handle = base::SharedMemoryHandle(
       base::FileDescriptor(static_cast<int>(platform_handle.value), false));
 #elif defined(OS_WIN)
   CHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE);
-  *memory_handle = base::SharedMemoryHandle(
-      reinterpret_cast<HANDLE>(platform_handle.value),
-      base::GetCurrentProcId());
+  *memory_handle =
+      base::SharedMemoryHandle(reinterpret_cast<HANDLE>(platform_handle.value));
 #endif
 
   return MOJO_RESULT_OK;