Fix OutOfMemoryDeathTest.AlignedAlloc when using USING_PARTITION_ALLOC_AS_MALLOC

This fixes a bug of https://chromium-review.googlesource.com/c/chromium/src/+/2418631

Bug: 998048
Change-Id: Iffb7b291d3e0689781e5dea7d011e74b68f186bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437668
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812640}

base/allocator/partition_allocator/partition_alloc.h

@@ -1111,8 +1111,10 @@ ALWAYS_INLINE void* PartitionRoot<thread_safe>::AlignedAllocFlags(
         << (sizeof(size_t) * 8 - base::bits::CountLeadingZeroBits(size - 1));
   }
 
+  // TODO(tasak): Clean up the following condition and PA_CHECK(requested_size
+  // >= size).
 #if BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC)
-  if (requested_size > MaxDirectMapped()) {
+  if (size > MaxDirectMapped()) {
     if (flags & PartitionAllocReturnNull)
       return nullptr;
     // OutOfMemoryDeathTest.AlignedAlloc requires base::OnNoMemoryInternal