crubit: introduce default cc_std global allocator

PiperOrigin-RevId: 872597117

Author: sam-mccall

support/cc_std_impl/cpp_std_allocator.rs

@@ -11,9 +11,6 @@ use core::alloc::Layout;
 use core::ffi::c_void;
 use core::ptr::NonNull;
 
-#[global_allocator]
-static ALLOCATOR: StdAllocator = StdAllocator {};
-
 pub struct StdAllocator {}
 
 unsafe impl Allocator for StdAllocator {

support/cc_std_impl/test/unique_ptr/unique_ptr_test.rs

@@ -2,7 +2,6 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-use cc_std::std::unique_ptr;
 use googletest::prelude::*;
 use std::sync::atomic::{AtomicI32, Ordering};
 
@@ -120,26 +119,6 @@ fn test_unique_ptr_destroyed_in_cpp() {
     test_helpers::unique_ptr_test::destroy_unique_ptr(up);
 }
 
-#[gtest]
-fn test_box_to_unique_ptr() {
-    let b = Box::new(InstanceCounted::new());
-    let ptr = Box::into_raw(b);
-    let up = unsafe { unique_ptr::new(ptr) };
-    assert_eq!(INSTANCE_COUNTER.load(Ordering::Acquire), 1);
-    drop(up);
-    assert_eq!(INSTANCE_COUNTER.load(Ordering::Acquire), 0);
-}
-
-#[gtest]
-fn test_unique_ptr_to_box() {
-    let mut up = InstanceCounted::new_unique_ptr();
-    let ptr = up.release();
-    let b = unsafe { Box::from_raw(ptr) };
-    assert_eq!(INSTANCE_COUNTER.load(Ordering::Acquire), 1);
-    drop(b);
-    assert_eq!(INSTANCE_COUNTER.load(Ordering::Acquire), 0);
-}
-
 #[gtest]
 fn test_unique_ptr_with_virtual_destructor() {
     let mut p = test_helpers::unique_ptr_test::create_virtual_base();