Code cleanup and typos in trace_event [NFC]

base/trace_event/heap_profiler_allocation_register_win.cc

Index: base/trace_event/heap_profiler_allocation_register_win.cc
diff --git a/base/trace_event/heap_profiler_allocation_register_win.cc b/base/trace_event/heap_profiler_allocation_register_win.cc
index 39cbb1807286de16a57d4d731906c21509b724c5..438b0ea7370bd0f20bdd5872663c8f82b488e6ee 100644
--- a/base/trace_event/heap_profiler_allocation_register_win.cc
+++ b/base/trace_event/heap_profiler_allocation_register_win.cc
@@ -51,7 +51,7 @@ void* AllocateGuardedVirtualMemory(size_t size) {
 }
 
 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);