Handle CreateFile() trimming trailing dots and spaces in downloads.

BUG=37007
TEST=unit_tests --gtest_filter=DownloadManagerTest.*

Review URL: http://codereview.chromium.org/660297

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@40479 0039d316-1c4b-4281-b951-d872f2087c98
std::wstring StripWWW(const std::wstring& text) {
  const std::wstring www(L"www.");
  return (text.compare(0, www.length(), www) == 0) ?
      text.substr(www.length()) : text;
}

std::wstring StripWWW(const std::wstring& text) {
  const std::wstring www(L"www.");
  return (text.compare(0, www.length(), www) == 0) ?
      text.substr(www.length()) : text;
}
