Get rid of base::SharedMemory::NULLHandle();

ppapi/proxy/serialized_handle.h

Index: ppapi/proxy/serialized_handle.h
diff --git a/ppapi/proxy/serialized_handle.h b/ppapi/proxy/serialized_handle.h
index d7e74ccb5427a9fb3e0379f2a9c61017ae69639a..3eb59931c2e219bed2a1a9aaf56625eef5b5e934 100644
--- a/ppapi/proxy/serialized_handle.h
+++ b/ppapi/proxy/serialized_handle.h
@@ -94,7 +94,7 @@ class PPAPI_PROXY_EXPORT SerializedHandle {
     type_ = SOCKET;
     descriptor_ = socket;
 
-    shm_handle_ = base::SharedMemory::NULLHandle();
+    shm_handle_ = base::SharedMemoryHandle();
     size_ = 0;
   }
   void set_file_handle(const IPC::PlatformFileForTransit& descriptor,
@@ -103,14 +103,12 @@ class PPAPI_PROXY_EXPORT SerializedHandle {
     type_ = FILE;
 
     descriptor_ = descriptor;
-    shm_handle_ = base::SharedMemory::NULLHandle();
+    shm_handle_ = base::SharedMemoryHandle();
     size_ = 0;
     open_flags_ = open_flags;
     file_io_ = file_io;
   }
-  void set_null_shmem() {
-    set_shmem(base::SharedMemory::NULLHandle(), 0);
-  }
+  void set_null_shmem() { set_shmem(base::SharedMemoryHandle(), 0); }
   void set_null_socket() {
     set_socket(IPC::InvalidPlatformFileForTransit());
   }