Fix type truncation warnings in HID code.

device/hid/hid_connection_linux.cc

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/hid/hid_connection_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <libudev.h>
 #include <linux/hidraw.h>
@@ skipping 93 matching lines @@
     }
     callback.Run(true);
   }
 }
 
 void HidConnectionLinux::PlatformGetFeatureReport(
     uint8_t report_id,
     const ReadCallback& callback) {
   // The first byte of the destination buffer is the report ID being requested
   // and is overwritten by the feature report.
-  DCHECK_GT(device_info().max_feature_report_size, 0);
+  DCHECK_GT(device_info().max_feature_report_size, 0u);
   scoped_refptr<net::IOBufferWithSize> buffer(
       new net::IOBufferWithSize(device_info().max_feature_report_size + 1));
   buffer->data()[0] = report_id;
 
   int result = ioctl(device_file_.GetPlatformFile(),
                      HIDIOCGFEATURE(buffer->size()),
                      buffer->data());
   if (result < 0) {
     VPLOG(1) << "Failed to get feature report";
     callback.Run(false, NULL, 0);
@@ skipping 94 matching lines @@
     PendingHidReport report = pending_reports_.front();
 
     pending_reports_.pop();
     if (CompleteRead(report.buffer, report.size, read.callback)) {
       pending_reads_.pop();
     }
   }
 }
 
 }  // namespace device