[Fuchsia] Use the read/write permission flag names when mapping VMOs.

The ZX_VM_FLAG_PERM_* names have been deprecated in favour of the
ZX_VM_PERM_* form, and will shortly be removed from the Fuchsia SDK.

Bug: chromium:925597
Change-Id: Ic05912cbf9758915e1bc97c41c682aee028a3b5d
Reviewed-on: https://chromium-review.googlesource.com/c/1437817Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59138}

src/base/platform/platform-fuchsia.cc

@@ -20,14 +20,13 @@ uint32_t GetProtectionFromMemoryPermission(OS::MemoryPermission access) {
     case OS::MemoryPermission::kNoAccess:
       return 0;  // no permissions
     case OS::MemoryPermission::kRead:
-      return ZX_VM_FLAG_PERM_READ;
+      return ZX_VM_PERM_READ;
     case OS::MemoryPermission::kReadWrite:
-      return ZX_VM_FLAG_PERM_READ | ZX_VM_FLAG_PERM_WRITE;
+      return ZX_VM_PERM_READ | ZX_VM_PERM_WRITE;
     case OS::MemoryPermission::kReadWriteExecute:
-      return ZX_VM_FLAG_PERM_READ | ZX_VM_FLAG_PERM_WRITE |
-             ZX_VM_FLAG_PERM_EXECUTE;
+      return ZX_VM_PERM_READ | ZX_VM_PERM_WRITE | ZX_VM_PERM_EXECUTE;
     case OS::MemoryPermission::kReadExecute:
-      return ZX_VM_FLAG_PERM_READ | ZX_VM_FLAG_PERM_EXECUTE;
+      return ZX_VM_PERM_READ | ZX_VM_PERM_EXECUTE;
   }
   UNREACHABLE();
 }
@@ -57,7 +56,7 @@ void* OS::Allocate(void* address, size_t size, size_t alignment,
                          strlen(kVirtualMemoryName));
   uintptr_t reservation;
   uint32_t prot = GetProtectionFromMemoryPermission(access);
-  if ((prot & ZX_VM_FLAG_PERM_EXECUTE) != 0) {
+  if ((prot & ZX_VM_PERM_EXECUTE) != 0) {
     if (zx_vmo_replace_as_executable(vmo, ZX_HANDLE_INVALID, &vmo) != ZX_OK) {
       return nullptr;
     }