Add sized delete operators to allocator shim

Sized deletion was added in c++14.  Now that Chrome is building with c++14, we
must override sized operator delete for symbol linkage consistency (see bug
855773).

R=thakis
BUG=855773

Change-Id: Idb673307939119ec520f71911e2074db2496b5ae
Reviewed-on: https://chromium-review.googlesource.com/1112731
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570172}

base/allocator/allocator_shim_override_cpp_symbols.h

@@ -49,3 +49,11 @@ SHIM_ALWAYS_EXPORT void operator delete[](void* p,
                                           const std::nothrow_t&) __THROW {
   ShimCppDelete(p);
 }
+
+SHIM_ALWAYS_EXPORT void operator delete(void* p, size_t) __THROW {
+  ShimCppDelete(p);
+}
+
+SHIM_ALWAYS_EXPORT void operator delete[](void* p, size_t) __THROW {
+  ShimCppDelete(p);
+}