Remove base::kInvalidPlatformFileValue from Chrome

chrome/browser/extensions/api/serial/serial_io_handler_posix.cc

 // Copyright 2013 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 "chrome/browser/extensions/api/serial/serial_io_handler_posix.h"
 
 #include "base/posix/eintr_wrapper.h"
 
+namespace {
+const base::PlatformFile kInvalidPlatformFileValue = -1;
+}  // namespace
+
 namespace extensions {
 
 // static
 scoped_refptr<SerialIoHandler> SerialIoHandler::Create() {
   return new SerialIoHandlerPosix();
 }
 
 void SerialIoHandlerPosix::ReadImpl() {
   DCHECK(CalledOnValidThread());
   DCHECK(pending_read_buffer());
-  DCHECK_NE(file(), base::kInvalidPlatformFileValue);
+  DCHECK_NE(file(), kInvalidPlatformFileValue);
 
   EnsureWatchingReads();
 }
 
 void SerialIoHandlerPosix::WriteImpl() {
   DCHECK(CalledOnValidThread());
   DCHECK(pending_write_buffer());
-  DCHECK_NE(file(), base::kInvalidPlatformFileValue);
+  DCHECK_NE(file(), kInvalidPlatformFileValue);
 
   EnsureWatchingWrites();
 }
 
 void SerialIoHandlerPosix::CancelReadImpl() {
   DCHECK(CalledOnValidThread());
   is_watching_reads_ = false;
   file_read_watcher_.StopWatchingFileDescriptor();
 }
 
@@ skipping 53 matching lines @@
   } else {
     // Stop watching the fd if we get notifications with no pending
     // writes to avoid starving the message loop.
     is_watching_writes_ = false;
     file_write_watcher_.StopWatchingFileDescriptor();
   }
 }
 
 void SerialIoHandlerPosix::EnsureWatchingReads() {
   DCHECK(CalledOnValidThread());
-  DCHECK_NE(file(), base::kInvalidPlatformFileValue);
+  DCHECK_NE(file(), kInvalidPlatformFileValue);
   if (!is_watching_reads_) {
     is_watching_reads_ = base::MessageLoopForIO::current()->WatchFileDescriptor(
         file(), true, base::MessageLoopForIO::WATCH_READ,
         &file_read_watcher_, this);
   }
 }
 
 void SerialIoHandlerPosix::EnsureWatchingWrites() {
   DCHECK(CalledOnValidThread());
-  DCHECK_NE(file(), base::kInvalidPlatformFileValue);
+  DCHECK_NE(file(), kInvalidPlatformFileValue);
   if (!is_watching_writes_) {
     is_watching_writes_ =
         base::MessageLoopForIO::current()->WatchFileDescriptor(
             file(), true, base::MessageLoopForIO::WATCH_WRITE,
             &file_write_watcher_, this);
   }
 }
 
 }  // namespace extensions