Code cleanup and typos in trace_event [NFC]

base/trace_event/heap_profiler_allocation_register_win.cc

 // 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.
 
 #include "base/trace_event/heap_profiler_allocation_register.h"
 
 #include <windows.h>
 #include <stddef.h>
 
 #include "base/bits.h"
@@ skipping 33 matching lines @@
   // read/write accessible space is still at least |min_size| bytes.
   void* guard_addr =
       reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(addr) + size);
   result = VirtualAlloc(guard_addr, GetGuardSize(), MEM_COMMIT, PAGE_NOACCESS);
   PCHECK(result != nullptr);
 
   return addr;
 }
 
 void FreeGuardedVirtualMemory(void* address, size_t allocated_size) {
-  // For |VirtualFree|, the size passed with |MEM_RELEASE| mut be 0. Windows
+  // For |VirtualFree|, the size passed with |MEM_RELEASE| must be 0. Windows
   // automatically frees the entire region that was reserved by the
   // |VirtualAlloc| with flag |MEM_RESERVE|.
   VirtualFree(address, 0, MEM_RELEASE);
 }
 
 }  // namespace internal
 }  // namespace trace_event
 }  // namespace base