Use the exact-width integer types defined in <stdint.h> rather than

net/base/file_stream_context_posix.cc

Index: net/base/file_stream_context_posix.cc
diff --git a/net/base/file_stream_context_posix.cc b/net/base/file_stream_context_posix.cc
index 489216fbc24879faa5e048ad1730b2de310c1c9d..dd62ebbe00b49faf816bf5777046e106ed922f48 100644
--- a/net/base/file_stream_context_posix.cc
+++ b/net/base/file_stream_context_posix.cc
@@ -80,8 +80,8 @@ int FileStream::Context::Write(IOBuffer* in_buf,
 
 FileStream::Context::IOResult FileStream::Context::SeekFileImpl(
     base::File::Whence whence,
-    int64 offset) {
-  int64 res = file_.Seek(whence, offset);
+    int64_t offset) {
+  int64_t res = file_.Seek(whence, offset);
   if (res == -1)
     return IOResult::FromOSError(errno);