Make use of v8::TickSample instead of v8::internal::TickSample in logger.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index 8b8ae55962436cfd613e8ec37650f7262461adb7..539a731dd72528bec80f83998c187659b4447c10 100644
--- a/src/log.h
+++ b/src/log.h
@@ -17,9 +17,7 @@
 
 namespace v8 {
 
-namespace base {
-class Semaphore;
-}
+struct TickSample;
 
 namespace sampler {
 class Sampler;
@@ -65,11 +63,15 @@ namespace internal {
 class CodeEventListener;
 class CpuProfiler;
 class Isolate;
+class JitLogger;
 class Log;
+class LowLevelLogger;
+class PerfBasicLogger;
+class PerfJitLogger;
 class Profiler;
-class Ticker;
+class ProfilerListener;
 class RuntimeCallTimer;
-struct TickSample;
+class Ticker;
 
 #undef LOG
 #define LOG(isolate, Call)                              \
@@ -84,12 +86,6 @@ struct TickSample;
     if (logger->is_logging_code_events()) logger->Call; \
   } while (false)
 
-class JitLogger;
-class PerfBasicLogger;
-class LowLevelLogger;
-class PerfJitLogger;
-class ProfilerListener;
-
 class Logger : public CodeEventListener {
  public:
   enum StartEnd { START = 0, END = 1 };