CommandLine: remove wstring-based program() accessor

CommandLine: remove wstring-based program() accessor

This was already removed on non-Windows, so this change modifies
the remaining Windows-specific usage.  In a few places I converted
use of wstring paths into FilePath, but in general for Windows-specific
code I don't think it's too important to use FilePath everywhere,
because it is equivalent on Windows and the current code already works.

BUG=23581
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=62637

[Evan Martin, 2010-10-13 21:36:14]

As requested.
Please review my logic carefully!

Trybot run:
http://build.chromium.org/buildbot/try-server/builders/win/builds/54030

[Evan Martin, 2010-10-14 18:22:34]

ping.

[viettrungluu, 2010-10-14 19:51:27]

LGTM. (I hope I didn't miss anything....)

http://codereview.chromium.org/3817001/diff/1/4
File base/command_line_unittest.cc (right):

http://codereview.chromium.org/3817001/diff/1/4#newcode109
base/command_line_unittest.cc:109: EXPECT_TRUE(cl.GetProgram().value().empty());
Or maybe even "GetProgram().empty()"?

http://codereview.chromium.org/3817001/diff/1/7
File chrome/installer/setup/setup_main.cc (right):

http://codereview.chromium.org/3817001/diff/1/7#newcode231
chrome/installer/setup/setup_main.cc:231: FilePath archive =
Probably the way to break this line (to be consistent with other line breaks in
this file) is:

FilePath archive = cmd_line.GetProgram().DirName().Append(
    installer::kChromeCompressedArchive);