Update from https://crrev.com/327068

base/files/file.cc

Index: base/files/file.cc
diff --git a/base/files/file.cc b/base/files/file.cc
index a997074bec4003b2474287d33785d844a354addb..8030bf13734e8a6b20bfe4f8f45ccc738885e075 100644
--- a/base/files/file.cc
+++ b/base/files/file.cc
@@ -4,10 +4,8 @@
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
-
-#if defined(OS_POSIX)
-#include "base/files/file_posix_hooks_internal.h"
-#endif
+#include "base/metrics/histogram.h"
+#include "base/timer/elapsed_timer.h"
 
 namespace base {
 
@@ -42,8 +40,6 @@ File::File(PlatformFile platform_file)
       async_(false) {
 #if defined(OS_POSIX)
   DCHECK_GE(platform_file, -1);
-  if (IsValid())
-    ProtectFileDescriptor(platform_file);
 #endif
 }
 
@@ -58,10 +54,6 @@ File::File(RValue other)
       error_details_(other.object->error_details()),
       created_(other.object->created()),
       async_(other.object->async_) {
-#if defined(OS_POSIX)
-   if (IsValid())
-     ProtectFileDescriptor(GetPlatformFile());
-#endif
 }
 
 File::~File() {
@@ -86,7 +78,7 @@ void File::Initialize(const FilePath& name, uint32 flags) {
     error_details_ = FILE_ERROR_ACCESS_DENIED;
     return;
   }
-  InitializeUnsafe(name, flags);
+  DoInitialize(name, flags);
 }
 #endif
 
@@ -134,4 +126,11 @@ std::string File::ErrorToString(Error error) {
   return "";
 }
 
+bool File::Flush() {
+  ElapsedTimer timer;
+  bool return_value = DoFlush();
+  UMA_HISTOGRAM_TIMES("PlatformFile.FlushTime", timer.Elapsed());
+  return return_value;
+}
+
 }  // namespace base