[NOT TO COMMIT!] r109: Diff of the current tcmalloc from the original google-perftools r109.

third_party/tcmalloc/chromium/src/memory_region_map.cc

Index: third_party/tcmalloc/chromium/src/memory_region_map.cc
diff --git a/third_party/tcmalloc/chromium/src/memory_region_map.cc b/third_party/tcmalloc/chromium/src/memory_region_map.cc
index 3f17ac79d88b8e6c3ad6b41ca749ee1c0dc5e125..31c3bc2f9bcd4f254b16637416f48f9455af0916 100644
--- a/third_party/tcmalloc/chromium/src/memory_region_map.cc
+++ b/third_party/tcmalloc/chromium/src/memory_region_map.cc
@@ -614,9 +614,9 @@ void MemoryRegionMap::MremapHook(const void* result,
   }
 }
 
-extern "C" void* __sbrk(ptrdiff_t increment);  // defined in libc
+extern "C" void* __sbrk(std::ptrdiff_t increment);  // defined in libc
 
-void MemoryRegionMap::SbrkHook(const void* result, ptrdiff_t increment) {
+void MemoryRegionMap::SbrkHook(const void* result, std::ptrdiff_t increment) {
   RAW_VLOG(10, "Sbrk = 0x%"PRIxPTR" of %"PRIdS"", (uintptr_t)result, increment);
   if (result != reinterpret_cast<void*>(-1)) {
     if (increment > 0) {