[NOT TO COMMIT!] Merge Chromium-specific changes in tcmalloc thru. the original gperftools r136.

third_party/tcmalloc/chromium/src/malloc_hook-inl.h

Index: third_party/tcmalloc/chromium/src/malloc_hook-inl.h
diff --git a/third_party/tcmalloc/chromium/src/malloc_hook-inl.h b/third_party/tcmalloc/chromium/src/malloc_hook-inl.h
index 62107849ed471e5af511ed333d9911db9ec70c7a..1fb7cd7878cb89441dc82dd80c67876f068fb031 100644
--- a/third_party/tcmalloc/chromium/src/malloc_hook-inl.h
+++ b/third_party/tcmalloc/chromium/src/malloc_hook-inl.h
@@ -293,7 +293,7 @@ inline MallocHook::PreSbrkHook MallocHook::GetPreSbrkHook() {
   return base::internal::presbrk_hook_.Get();
 }
 
-inline void MallocHook::InvokePreSbrkHook(ptrdiff_t increment) {
+inline void MallocHook::InvokePreSbrkHook(std::ptrdiff_t increment) {
   if (!base::internal::presbrk_hooks_.empty() && increment != 0) {
     InvokePreSbrkHookSlow(increment);
   }
@@ -309,7 +309,7 @@ inline MallocHook::SbrkHook MallocHook::GetSbrkHook() {
 }
 
 inline void MallocHook::InvokeSbrkHook(const void* result,
-                                       ptrdiff_t increment) {
+                                       std::ptrdiff_t increment) {
   if (!base::internal::sbrk_hooks_.empty() && increment != 0) {
     InvokeSbrkHookSlow(result, increment);
   }