[tracing] Optimize AllocationRegister and increase max backtrace depth.

base/trace_event/heap_profiler_allocation_register_posix.cc

Index: base/trace_event/heap_profiler_allocation_register_posix.cc
diff --git a/base/trace_event/heap_profiler_allocation_register_posix.cc b/base/trace_event/heap_profiler_allocation_register_posix.cc
index c38d7e69182b9a3d73537cc2d4ac148aca9972a1..8caec5e9e935db7f460f32b7d29a1d083d3b086f 100644
--- a/base/trace_event/heap_profiler_allocation_register_posix.cc
+++ b/base/trace_event/heap_profiler_allocation_register_posix.cc
@@ -18,6 +18,7 @@
 
 namespace base {
 namespace trace_event {
+namespace internal {
 
 namespace {
 size_t GetGuardSize() {
@@ -25,8 +26,7 @@ size_t GetGuardSize() {
 }
 }
 
-// static
-void* AllocationRegister::AllocateVirtualMemory(size_t size) {
+void* AllocateGuardedVirtualMemory(size_t size) {
   size = bits::Align(size, GetPageSize());
 
   // Add space for a guard page at the end.
@@ -49,11 +49,11 @@ void* AllocationRegister::AllocateVirtualMemory(size_t size) {
 }
 
 // static
-void AllocationRegister::FreeVirtualMemory(void* address,
-                                           size_t allocated_size) {
+void FreeGuardedVirtualMemory(void* address, size_t allocated_size) {
   size_t size = bits::Align(allocated_size, GetPageSize()) + GetGuardSize();
   munmap(address, size);
 }
 
+}  // namespace internal
 }  // namespace trace_event
 }  // namespace base