Revert of [heap] Fix a formatting bug in --trace-incremental-marking....

Revert of [heap] Fix a formatting bug in --trace-incremental-marking. (patchset #2 id:20001 of https://codereview.chromium.org/2324623004/ )

Reason for revert:
Revert to check if this is causing perf regressions in crbug.com/645411

Original issue's description:
> [heap] Fix a formatting bug in --trace-incremental-marking.
>
> BUG=
>
> Committed: https://crrev.com/212624b7570cd1c1cfad7cf958203b05af961637
> Cr-Commit-Position: refs/heads/master@{#39278}

TBR=mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2323293002
Cr-Commit-Position: refs/heads/master@{#39305}

src/heap/heap.cc

@@ -810,9 +810,7 @@ void Heap::ScheduleIdleScavengeIfNeeded(int bytes_allocated) {
 
 void Heap::FinalizeIncrementalMarking(GarbageCollectionReason gc_reason) {
   if (FLAG_trace_incremental_marking) {
-    isolate()->PrintWithTimestamp(
-        "[IncrementalMarking] (%s).\n",
-        Heap::GarbageCollectionReasonToString(gc_reason));
+    isolate()->PrintWithTimestamp("[IncrementalMarking] (%s).\n", gc_reason);
   }
 
   HistogramTimerScope incremental_marking_scope(

src/isolate.h

@@ -1162,7 +1162,7 @@ class Isolate {
 
   bool IsIsolateInBackground() { return is_isolate_in_background_; }
 
-  PRINTF_FORMAT(2, 3) void PrintWithTimestamp(const char* format, ...);
+  void PrintWithTimestamp(const char* format, ...);
 
  protected:
   explicit Isolate(bool enable_serializer);