[StyleGuide] Allow begin and end non-member functions

base/trace_event/heap_profiler_allocation_context_tracker.cc

Index: base/trace_event/heap_profiler_allocation_context_tracker.cc
diff --git a/base/trace_event/heap_profiler_allocation_context_tracker.cc b/base/trace_event/heap_profiler_allocation_context_tracker.cc
index b58fb60028fd1a641216e5fdd9b054ba99fb6be1..51e4590f9f08eb2e647fbbdd189ab0cd556ac5a4 100644
--- a/base/trace_event/heap_profiler_allocation_context_tracker.cc
+++ b/base/trace_event/heap_profiler_allocation_context_tracker.cc
@@ -5,6 +5,7 @@
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 
 #include <algorithm>
+#include <iterator>
 
 #include "base/atomicops.h"
 #include "base/threading/thread_local_storage.h"
@@ -25,13 +26,6 @@ void DestructAllocationContextTracker(void* alloc_ctx_tracker) {
   delete static_cast<AllocationContextTracker*>(alloc_ctx_tracker);
 }
 
-// Returns a pointer past the end of the fixed-size array |array| of |T| of
-// length |N|, identical to C++11 |std::end|.
-template <typename T, int N>
-T* End(T(&array)[N]) {
-  return array + N;
-}
-
 }  // namespace
 
 AllocationContextTracker::AllocationContextTracker() {}
@@ -99,9 +93,9 @@ AllocationContext AllocationContextTracker::GetContextSnapshot() {
   // Fill the backtrace.
   {
     auto src = tracker->pseudo_stack_.begin();
-    auto dst = ctx.backtrace.frames;
+    auto dst = std::begin(ctx.backtrace.frames);
     auto src_end = tracker->pseudo_stack_.end();
-    auto dst_end = End(ctx.backtrace.frames);
+    auto dst_end = std::end(ctx.backtrace.frames);
 
     // Copy as much of the bottom of the pseudo stack into the backtrace as
     // possible.