[cleanup] Remove unnecessary namespace qualification

Bug: v8:7570
Change-Id: I1653f216962b99161e21e0e8342164f10d5928cb
Reviewed-on: https://chromium-review.googlesource.com/1004579Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52510}

src/deoptimizer.cc

@@ -1813,9 +1813,8 @@ void Deoptimizer::MaterializeHeapObjects() {
   translated_state_.Prepare(reinterpret_cast<Address>(stack_fp_));
   if (FLAG_deopt_every_n_times > 0) {
     // Doing a GC here will find problems with the deoptimized frames.
-    isolate_->heap()->CollectAllGarbage(
-        i::Heap::kFinalizeIncrementalMarkingMask,
-        i::GarbageCollectionReason::kTesting);
+    isolate_->heap()->CollectAllGarbage(Heap::kFinalizeIncrementalMarkingMask,
+                                        GarbageCollectionReason::kTesting);
   }
 
   for (auto& materialization : values_to_materialize_) {