Remove unusued instance variable of chrome::VersionInfo.

The instance variable chrome::VersionInfo::version_info_ is never used
and can be safely removed. Also remove the forward-declaration of the
FileVersionInfo class and the corresponding #include in the implementation
file.

BUG=None

Review URL: https://codereview.chromium.org/1244773003

Cr-Commit-Position: refs/heads/master@{#339851}

chrome/app/close_handle_hook_win.cc

@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/win/iat_patch_function.h"
 #include "base/win/pe_image.h"
 #include "base/win/scoped_handle.h"

chrome/common/chrome_version_info.cc

@@ -5,7 +5,6 @@
 #include "chrome/common/chrome_version_info.h"
 
 #include "base/basictypes.h"
-#include "base/file_version_info.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"

chrome/common/chrome_version_info.h

@@ -8,9 +8,6 @@
 #include <string>
 
 #include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-
-class FileVersionInfo;
 
 namespace chrome {
 
@@ -81,10 +78,6 @@ class VersionInfo {
   std::string CreateVersionString() const;
 
  private:
-#if defined(OS_WIN) || defined(OS_MACOSX)
-  scoped_ptr<FileVersionInfo> version_info_;
-#endif
-
   DISALLOW_COPY_AND_ASSIGN(VersionInfo);
 };