net: Minor cleanup for FileStream implementation on Windows.
net: Minor cleanup for FileStream implementation on Windows.

s/INVALID_HANDLE_VALUE/base::kInvalidPlatformFileValue/g

Per base/platform_file.h, these are the same thing.

BUG=none
TEST=chrome and tests build.


Review URL: http://codereview.chromium.org/9422014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@122706 0039d316-1c4b-4281-b951-d872f2087c98

yitian134/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,adobe/chromium