Fix determining of JS lower stack bottom used in profiler's JS stack tracer to work with Chromium.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index 10d88330ee18cd10862747c5a0ddf48eedac423b..2f8f81c95bad62dfa9659e8e91f0a4232f7a26c4 100644
--- a/src/log.h
+++ b/src/log.h
@@ -277,14 +277,9 @@ class Logger {
 
 
 // Class that extracts stack trace, used for profiling.
-class StackTracer BASE_EMBEDDED {
+class StackTracer : public AllStatic {
  public:
-  explicit StackTracer(uintptr_t low_stack_bound)
-      : low_stack_bound_(low_stack_bound) { }
-  void Trace(TickSample* sample);
- private:
-
-  uintptr_t low_stack_bound_;
+  static void Trace(TickSample* sample);
 };