Convert the webkit build on Windows to gyp:...

Convert the webkit build on Windows to gyp:
* build\all.gyp now uses webkit\webkit.gyp and
  webkit\tools\test_shell\test_shell.gyp.
* 'svn remove' checked-in .sln and .vcproj files that will now
  become gyp-generated files.  (We'll leave the other old ones
  in place, uncalled, and remove them with a later CL.)
* Add generated *.sln and *.vcproj files to svn:ignore on
  the relevant directories.
* Update various chrome\**.vcproj files with the new gyp directory
  in which various generated webkit files will now appear.
* Update the checked-in chrome\chrome.sln with all (?) the changes
  necessary to reflect the new gyp generation.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=15618

[sgk, 2009-05-08 02:21:07]

TBR=mark

Should be in close to final form, pending last sanity-check builds while
grabbing dinner and waiting for the countdown...

[Mark Mentovai, 2009-05-08 02:32:36]

Excellent.  LG.