Cleanup before adding the MSBuild code: add "ForMSVS" to many functions, restructure a few others.
Cleanup before adding the MSBuild code: add "ForMSVS" to many functions, restructure a few others.

BUG=96
TEST=Compare the .vcproj files generated for Chrome before and after the change.  Run the unit tests.

Review URL: http://codereview.chromium.org/6236001

csulmone/gyp,csulmone/gyp,csulmone/gyp,csulmone/gyp