Fuchsia: Switch to new virtual memory syscalls

runtime/vm/virtual_memory_fuchsia.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_FUCHSIA)
 
 #include "vm/virtual_memory.h"
 
 #include <magenta/syscalls.h>
@@ skipping 19 matching lines @@
   if (status != NO_ERROR) {
     return NULL;
   }
 
   // TODO(zra): map with PERM_NONE, when that works, and relax with
   // Commit and Protect when they are implemented.
   // Issue MG-161.
   const int prot =
       MX_VM_FLAG_PERM_READ | MX_VM_FLAG_PERM_WRITE | MX_VM_FLAG_PERM_EXECUTE;
   uintptr_t addr;
-  status = mx_process_map_vm(mx_process_self(), vmo, 0, size, &addr, prot);
+  status = mx_vmar_map(mx_vmar_root_self(), 0, vmo, 0, size, prot, &addr);
   if (status != NO_ERROR) {
     mx_handle_close(vmo);
     FATAL("VirtualMemory::ReserveInternal FAILED");
     return NULL;
   }
 
   MemoryRegion region(reinterpret_cast<void*>(addr), size);
   return new VirtualMemory(region, vmo);
 }
 
 
 VirtualMemory::~VirtualMemory() {
   if (!embedder_allocated()) {
     // TODO(zra): Use reserved_size_.
     // Issue MG-162.
     uintptr_t addr = reinterpret_cast<uintptr_t>(address());
     mx_status_t status =
-        mx_process_unmap_vm(mx_process_self(), addr, 0 /*reserved_size_*/);
+        mx_vmar_unmap(mx_vmar_root_self(), addr, 0 /*reserved_size_*/);
     if (status != NO_ERROR) {
       FATAL("VirtualMemory::~VirtualMemory: unamp FAILED");
     }
 
     status = mx_handle_close(handle());
     if (status != NO_ERROR) {
       FATAL("VirtualMemory::~VirtualMemory: handle_close FAILED");
     }
   }
 }
@@ skipping 14 matching lines @@
 
 
 bool VirtualMemory::Protect(void* address, intptr_t size, Protection mode) {
   // TODO(zra): Implement when Fuchsia has an mprotect-like call.
   return true;
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_FUCHSIA)