[Backport] Fix NoDestructor::PlacementStorage::get() const

It was trying to call a storage() method, which doesn't exist in
PlacementStorage. This was uncovered by a recent Clang change:
llvm/llvm-project#90152

Upstream-Status: Backport [https://chromium-review.googlesource.com/c/chromium/src/+/5515154]

Bug: 338536260
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5515154
Auto-Submit: Hans Wennborg <[email protected]>
Commit-Queue: Daniel Cheng <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Commit-Queue: Hans Wennborg <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1296238}
Change-Id: Ib03c42053429b33af592894f0ce39ea4faaf68ad
Pick-to: 118-based
Reviewed-on: https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/586023
Reviewed-by: Peter Varga <[email protected]>

Author: zmodem

chromium/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/no_destructor.h

@@ -122,9 +122,7 @@ class NoDestructor {
       new (storage_) T(std::forward<Args>(args)...);
     }
 
-    const T* get() const {
-      return const_cast<PlacementStorage*>(this)->storage();
-    }
+    const T* get() const { return const_cast<PlacementStorage*>(this)->get(); }
     T* get() { return reinterpret_cast<T*>(storage_); }
 
    private: