net: Update FileStream to use base::File instead of PlatformFile.

base/android/content_uri_utils.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 "base/android/content_uri_utils.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
-#include "base/platform_file.h"
 #include "jni/ContentUriUtils_jni.h"
 
 using base::android::ConvertUTF8ToJavaString;
 
 namespace base {
 
 bool RegisterContentUriUtils(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 bool ContentUriExists(const FilePath& content_uri) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> j_uri =
       ConvertUTF8ToJavaString(env, content_uri.value());
   return Java_ContentUriUtils_contentUriExists(
       env, base::android::GetApplicationContext(), j_uri.obj());
 }
 
-int OpenContentUriForRead(const FilePath& content_uri) {
+File OpenContentUriForRead(const FilePath& content_uri) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> j_uri =
       ConvertUTF8ToJavaString(env, content_uri.value());
   jint fd = Java_ContentUriUtils_openContentUriForRead(
       env, base::android::GetApplicationContext(), j_uri.obj());
   if (fd < 0)
-    return base::kInvalidPlatformFileValue;
-  return fd;
+    return File();
+  return File(fd);
 }
 
 }  // namespace base