[inspector] Store interger in context embedder data instead of a string.

src/inspector/v8-debugger-script.h

Index: src/inspector/v8-debugger-script.h
diff --git a/src/inspector/v8-debugger-script.h b/src/inspector/v8-debugger-script.h
index 3484ba6d16e7ad7f8b200350214674f254c85902..58beefe5eca155901367f5cff686c959a27273fa 100644
--- a/src/inspector/v8-debugger-script.h
+++ b/src/inspector/v8-debugger-script.h
@@ -62,7 +62,6 @@ class V8DebuggerScript {
   int endLine() const { return m_endLine; }
   int endColumn() const { return m_endColumn; }
   int executionContextId() const { return m_executionContextId; }
-  virtual const String16& executionContextAuxData() const = 0;
   virtual bool isLiveEdit() const = 0;
 
   void setSourceURL(const String16&);