base/allocator: Fix the argument type of malloc_size

malloc_size is provided only on macOS/iOS (the counterpart on
GNU/Linux is malloc_usable_size) and the argument type is
|const void*| [1].  This patch fixes the argument type.

[1] https://opensource.apple.com/source/Libc/Libc-825.26/include/malloc/malloc.h.auto.html

Change-Id: I62e57d4f7bae1098db92ede760a1fdf44746d4a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505334
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822607}

base/allocator/allocator_shim_override_libc_symbols.h

@@ -10,7 +10,11 @@
 #endif
 #define BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_LIBC_SYMBOLS_H_
 
+#if defined(OS_APPLE)
+#include <malloc/malloc.h>
+#else
 #include <malloc.h>
+#endif
 
 #include "base/allocator/allocator_shim_internals.h"
 
@@ -56,7 +60,7 @@ SHIM_ALWAYS_EXPORT int posix_memalign(void** r, size_t a, size_t s) __THROW {
   return ShimPosixMemalign(r, a, s);
 }
 
-SHIM_ALWAYS_EXPORT size_t malloc_size(void* address) __THROW {
+SHIM_ALWAYS_EXPORT size_t malloc_size(const void* address) __THROW {
   return ShimGetSizeEstimate(address, nullptr);
 }