Fix VirtualMemory for Fuchsia to pass |hints| to ReserveRegion.

TBR: machenbach, hablich, kozyatinskiy

Change-Id: Id5cbcc1260b69a68dded46651471bd1cfa57d3a3
Reviewed-on: https://chromium-review.googlesource.com/571114Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46685}

src/base/platform/platform-fuchsia.cc

@@ -38,7 +38,7 @@ void OS::SignalCodeMovingGC() {
 VirtualMemory::VirtualMemory() : address_(NULL), size_(0) {}
 
 VirtualMemory::VirtualMemory(size_t size, void* hint)
-    : address_(ReserveRegion(size)), size_(size) {
+    : address_(ReserveRegion(size, hint)), size_(size) {
   CHECK(false);  // TODO(fuchsia): Port, https://crbug.com/731217.
 }