IPC: Use <algorithm> helpers for comparing arrays

ipc/brokerable_attachment.h

 // Copyright 2015 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.
 
 #ifndef IPC_BROKERABLE_ATTACHMENT_H_
 #define IPC_BROKERABLE_ATTACHMENT_H_
 
 #include <stdint.h>
 
+#include <algorithm>
+
 #include "base/macros.h"
 #include "ipc/ipc_export.h"
 #include "ipc/ipc_message_attachment.h"
 
 namespace IPC {
 
 // This subclass of MessageAttachment requires an AttachmentBroker to be
 // attached to a Chrome IPC message.
 class IPC_EXPORT BrokerableAttachment : public MessageAttachment {
  public:
@@ skipping 10 matching lines @@
     // constructor.
     AttachmentId();
 
     // Constructs an AttachmentId from a buffer.
     AttachmentId(const char* start_address, size_t size);
 
     // Writes the nonce into a buffer.
     void SerializeToBuffer(char* start_address, size_t size);
 
     bool operator==(const AttachmentId& rhs) const {
-      for (size_t i = 0; i < kNonceSize; ++i) {
-        if (nonce[i] != rhs.nonce[i])
-          return false;
-      }
-      return true;
+      return std::equal(nonce, nonce + kNonceSize, rhs.nonce);
     }
 
     bool operator<(const AttachmentId& rhs) const {
-      for (size_t i = 0; i < kNonceSize; ++i) {
-        if (nonce[i] < rhs.nonce[i])
-          return true;
-        if (nonce[i] > rhs.nonce[i])
-          return false;
-      }
-      return false;
+      return std::lexicographical_compare(nonce, nonce + kNonceSize, rhs.nonce,
+                                          rhs.nonce + kNonceSize);
     }
   };
 
   enum BrokerableType {
     PLACEHOLDER,
     WIN_HANDLE,
     MACH_PORT,
   };
 
   // The identifier is unique across all Chrome processes.
@@ skipping 22 matching lines @@
   // This member uniquely identifies a BrokerableAttachment across all Chrome
   // processes.
   const AttachmentId id_;
 
   DISALLOW_COPY_AND_ASSIGN(BrokerableAttachment);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_BROKERABLE_ATTACHMENT_H_