[Isolates] Merge from bleeding_edge, revisions 5934-6100.

include/v8-preparser.h

Index: include/v8-preparser.h
===================================================================
--- include/v8-preparser.h	(revision 6904)
+++ include/v8-preparser.h	(working copy)
@@ -99,13 +99,6 @@
   // Returns the next Unicode code-point in the input, or a negative value when
   // there is no more input in the stream.
   virtual int32_t Next() = 0;
-
-  // Pushes a read character back into the stream, so that it will be the next
-  // to be read by Advance(). The character pushed back must be the most
-  // recently read character that hasn't already been pushed back (i.e., if
-  // pushing back more than one character, they must occur in the opposite order
-  // of the one they were read in).
-  virtual void PushBack(int32_t ch) = 0;
 };