Switch to standard integer types in chrome/browser/, part 2 of 4.

chrome/browser/media_galleries/win/mtp_device_object_enumerator.cc

Index: chrome/browser/media_galleries/win/mtp_device_object_enumerator.cc
diff --git a/chrome/browser/media_galleries/win/mtp_device_object_enumerator.cc b/chrome/browser/media_galleries/win/mtp_device_object_enumerator.cc
index 5e3fc27bb34effa0022a6c45d9c01ed1b8ef59f9..802f80a7c78bc09e1b8a368d71b3e9e2b7cda3d8 100644
--- a/chrome/browser/media_galleries/win/mtp_device_object_enumerator.cc
+++ b/chrome/browser/media_galleries/win/mtp_device_object_enumerator.cc
@@ -33,7 +33,7 @@ base::FilePath MTPDeviceObjectEnumerator::Next() {
   return base::FilePath(object_entries_[index_].name);
 }
 
-int64 MTPDeviceObjectEnumerator::Size() {
+int64_t MTPDeviceObjectEnumerator::Size() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!IsIndexReadyAndInRange())
     return 0;