Define kInvalidPlatformFile in base

mojo/public/cpp/system/platform_handle.cc

 // Copyright 2016 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.
 
 #include "mojo/public/cpp/system/platform_handle.h"
 
 namespace mojo {
 
 namespace {
 
@@ skipping 30 matching lines @@
 
 MojoResult UnwrapPlatformFile(ScopedHandle handle, base::PlatformFile* file) {
   MojoPlatformHandle platform_handle;
   platform_handle.struct_size = sizeof(MojoPlatformHandle);
   MojoResult result = MojoUnwrapPlatformHandle(handle.release().value(),
                                                &platform_handle);
   if (result != MOJO_RESULT_OK)
     return result;
 
   if (platform_handle.type == MOJO_PLATFORM_HANDLE_TYPE_INVALID) {
-    *file = kInvalidPlatformFile;
+    *file = base::kInvalidPlatformFile;
   } else {
     CHECK_EQ(platform_handle.type, kPlatformFileHandleType);
     *file = PlatformFileFromPlatformHandleValue(platform_handle.value);
   }
 
   return MOJO_RESULT_OK;
 }
 
 ScopedSharedBufferHandle WrapSharedMemoryHandle(
     const base::SharedMemoryHandle& memory_handle,
@@ skipping 58 matching lines @@
   CHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE);
   *memory_handle = base::SharedMemoryHandle(
       reinterpret_cast<HANDLE>(platform_handle.value),
       base::GetCurrentProcId());
 #endif
 
   return MOJO_RESULT_OK;
 }
 
 }  // namespace mojo