allocator: rename use_experimental_allocator_shim to use_allocator_shim

base/allocator/allocator_shim_override_glibc_weak_symbols.h

Index: base/allocator/allocator_shim_override_glibc_weak_symbols.h
diff --git a/base/allocator/allocator_shim_override_glibc_weak_symbols.h b/base/allocator/allocator_shim_override_glibc_weak_symbols.h
index 7f50ac81c308404cb7d4a6ad2b2bce084316dca8..9142bdaf2725f516ab61c411761887665dd00e17 100644
--- a/base/allocator/allocator_shim_override_glibc_weak_symbols.h
+++ b/base/allocator/allocator_shim_override_glibc_weak_symbols.h
@@ -115,5 +115,5 @@ SHIM_ALWAYS_EXPORT int __posix_memalign(void** r, size_t a, size_t s) {
 // Safety check.
 #if !defined(__GLIBC__)
 #error The target platform does not seem to use Glibc. Disable the allocator \
-shim by setting use_experimental_allocator_shim=false in GN args.
+shim by setting use_allocator_shim=false in GN args.
 #endif