base/allocator: Fix PartitionAlloc as malloc().

https://chromium-review.googlesource.com/c/chromium/src/+/2235695 didn't
update the "PartitionAlloc everywhere" config. Fix it here.

Bug: 998048
Change-Id: I57c5fe76d4aac50b47967bf9d246f224295e2e40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249738Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779295}

base/allocator/allocator_shim_default_dispatch_to_partition_alloc.cc

@@ -10,8 +10,8 @@
 
 namespace {
 
-base::PartitionRootGeneric& Allocator() {
-  static base::NoDestructor<base::PartitionRootGeneric> allocator;
+base::ThreadSafePartitionRoot& Allocator() {
+  static base::NoDestructor<base::ThreadSafePartitionRoot> allocator;
   allocator->Init();
   return *allocator;
 }
@@ -67,7 +67,7 @@ size_t PartitionGetSizeEstimate(const AllocatorDispatch*,
                                 void* address,
                                 void* context) {
   // TODO(lizeb): Returns incorrect values for aligned allocations.
-  return base::PartitionAllocGetSize(address);
+  return base::PartitionAllocGetSize<base::internal::ThreadSafe>(address);
 }
 
 }  // namespace