Fix type error

runtime/bin/socket.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/socket.h"
 #include "bin/dartutils.h"
 
 #include "platform/utils.h"
 
 #include "include/dart_api.h"
@@ skipping 73 matching lines @@
   intptr_t buffer_len = 0;
   Dart_Handle result = Dart_ListLength(buffer_obj, &buffer_len);
   ASSERT(!Dart_IsError(result));
   ASSERT((offset + length) <= buffer_len);
 
   if (Dart_IsVMFlagSet("short_socket_write")) {
     length = (length + 1) / 2;
   }
 
   // Send data in chunks of maximum 16KB.
-  const intptr_t max_chunk_length = dart::Utils::Minimum(length, 16 * KB);
+  const intptr_t max_chunk_length =
+      dart::Utils::Minimum(length, static_cast<intptr_t>(16 * KB));
   uint8_t* buffer = new uint8_t[max_chunk_length];
   intptr_t total_bytes_written = 0;
   intptr_t bytes_written = 0;
   do {
     intptr_t chunk_length =
         dart::Utils::Minimum(max_chunk_length, length - total_bytes_written);
     result = Dart_ListGetAsBytes(buffer_obj,
                                  offset + total_bytes_written,
                                  buffer,
                                  chunk_length);
@@ skipping 57 matching lines @@
                                          DartUtils::kIdFieldName);
   Dart_Handle socketobj = Dart_GetNativeArgument(args, 1);
   intptr_t newSocket = ServerSocket::Accept(socket);
   if (newSocket >= 0) {
     DartUtils::SetIntegerInstanceField(
         socketobj, DartUtils::kIdFieldName, newSocket);
   }
   Dart_SetReturnValue(args, Dart_NewBoolean(newSocket >= 0));
   Dart_ExitScope();
 }