Fix a Clobbered build break.
Fix a Clobbered build break.

Not sure why it wasn't picked up earlier, but if I build from scratch I get the following error:

--------------------Configuration: chrome_version_header - Release Win32-----------------------
Generating version header file: "C:\b\slave\build\src\chrome\Release/obj/global_intermediate/version.h"
Traceback (most recent call last):
 File "tools/build/version.py", line 197, in ?
  sys.exit(main())
 File "tools/build/version.py", line 169, in main
  values = fetch_values(variable_files)
 File "tools/build/version.py", line 55, in fetch_values
  fetch_values_from_file(values, file_name)
 File "tools/build/version.py", line 30, in fetch_values_from_file
  for line in open(file_name, 'r').readlines():
IOError: [Errno 2] No such file or directory: 'C:/b/slave/build/src/chrome/Release/obj/global_intermediate/build/LASTCHANGE'
Project : error PRJ0002 : Error result 1 returned from 'C:\Windows\SysWow64\cmd.exe'.
Build log was saved at "file://C:\b\slave\build\src\chrome\Release\obj\chrome_version_header\BuildLog.htm"
chrome_version_header - 1 error(s), 0 warning(s)


TBR=robertshield


git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@47115 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser