Make the Alias (phony) nodes that correspond to the gyp targets the exact name of the target, instead of "gyp_target_{target}.  This allows users to specify "scons {target}" on the command line.
Make the Alias (phony) nodes that correspond to the gyp targets the exact
name of the target, instead of "gyp_target_{target}.  This allows users
to specify "scons {target}" on the command line.

This required disambiguating the target that we pass to
env.ChromeProgram(), so that it's not up to different parts of the
underlying SCons code to decide whether a string like 'chrome' refers
to the Alias or the on-disk File.
Review URL: http://codereview.chromium.org/57036
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp