Fix minor issues in ChromeDriver.

chrome/test/webdriver/session_manager.h

Index: chrome/test/webdriver/session_manager.h
diff --git a/chrome/test/webdriver/session_manager.h b/chrome/test/webdriver/session_manager.h
index 5f7ce395fed97292a4821191988a289733101146..5962ec7a7af339ca7bea4bd320088719ddcdfe36 100644
--- a/chrome/test/webdriver/session_manager.h
+++ b/chrome/test/webdriver/session_manager.h
@@ -38,9 +38,6 @@ class SessionManager {
   void set_url_base(const std::string& url_base);
   std::string url_base() const;
 
-  void set_chrome_dir(const FilePath& chrome_dir);
-  FilePath chrome_dir() const;
-
  private:
   SessionManager();
   ~SessionManager();
@@ -50,7 +47,6 @@ class SessionManager {
   mutable base::Lock map_lock_;
   std::string port_;
   std::string url_base_;
-  FilePath chrome_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionManager);
 };