Remove support for logging into a memory buffer.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index f243fc53c83def8bbd01163094f790bf3ef34258..02250595f840015ef47afe5ae490d97a63730f85 100644
--- a/src/log.h
+++ b/src/log.h
@@ -157,7 +157,9 @@ class Logger {
   Sampler* sampler();
 
   // Frees resources acquired in Setup.
-  void TearDown();
+  // When a temporary file is used for the log, returns its stream descriptor,
+  // leaving the file open.
+  FILE* TearDown();
 
   // Enable the computation of a sliding window of states.
   void EnableSlidingStateWindow();
@@ -279,10 +281,6 @@ class Logger {
   void ResumeProfiler();
   bool IsProfilerPaused();
 
-  // If logging is performed into a memory buffer, allows to
-  // retrieve previously written messages. See v8.h.
-  int GetLogLines(int from_pos, char* dest_buf, int max_size);
-
   // Logs all compiled functions found in the heap.
   void LogCompiledFunctions();
   // Logs all accessor callbacks found in the heap.