Remove tcmalloc when not being used. Restore shim on Windows.

base/allocator/generic_allocators.cc

Index: base/allocator/generic_allocators.cc
diff --git a/base/allocator/generic_allocators.cc b/base/allocator/generic_allocators.cc
index d12f3b976ac274c4526cc25ad143b130f0ac0203..72c4da70da9d30b10531f69a5bc017e51af643ee 100644
--- a/base/allocator/generic_allocators.cc
+++ b/base/allocator/generic_allocators.cc
@@ -16,7 +16,7 @@ inline void* generic_cpp_alloc(size_t size, bool nothrow) {
     ptr = malloc(size);
     if (ptr)
       return ptr;
-    if (!call_new_handler(nothrow))
+    if (!call_new_handler(nothrow, size))
       break;
   }
   return ptr;