Remove CreatePlatformFile from content shell.

base/file_descriptor_posix.h

Index: base/file_descriptor_posix.h
diff --git a/base/file_descriptor_posix.h b/base/file_descriptor_posix.h
index abc07893fafd2df96c9b44664d179920da244d3c..093dd2fdb37abe01513863bed3e69d3747256792 100644
--- a/base/file_descriptor_posix.h
+++ b/base/file_descriptor_posix.h
@@ -5,6 +5,8 @@
 #ifndef BASE_FILE_DESCRIPTOR_POSIX_H_
 #define BASE_FILE_DESCRIPTOR_POSIX_H_
 
+#include "base/files/file.h"
+
 namespace base {
 
 // -----------------------------------------------------------------------------
@@ -16,13 +18,12 @@ namespace base {
 // above the template specialisation for this structure.
 // -----------------------------------------------------------------------------
 struct FileDescriptor {
-  FileDescriptor()
-      : fd(-1),
-        auto_close(false) { }
+  FileDescriptor() : fd(-1), auto_close(false) {}
+
+  FileDescriptor(int ifd, bool iauto_close) : fd(ifd), auto_close(iauto_close) {
+  }
 
-  FileDescriptor(int ifd, bool iauto_close)
-      : fd(ifd),
-        auto_close(iauto_close) { }
+  FileDescriptor(File file) : fd(file.TakePlatformFile()), auto_close(true) {}
 
   bool operator==(const FileDescriptor& other) const {
     return (fd == other.fd && auto_close == other.auto_close);