Move Version Assembly code out of chrome_elf.

chrome_elf/README

-Chrome Early Loading Framework (aka ChromeELF)
-
-chrome_elf.dll is shipped in Chrome's version directory to ease updates,
-and is loaded early in chrome.exe's lifetime. This is done by turning the
-version directory into a private assembly which refers to chrome_elf.dll
-(http://msdn.microsoft.com/library/aa374224.aspx).
-
-In an ideal world, this would be done by embedding an application config in
-chrome.exe that would refer to the proper version directory via a
-probing\privatePath attribute (http://msdn.microsoft.com/library/aa374182.aspx).
-This would allow us to refer to dlls in the version directory without having to
-make the version directory itself into an assembly. It would also avoid naming
-conflicts (as the WinSxS dir and GAC both take precedence over private
-assemblies when searching for dlls). Unfortunately, the probing\privatePath
-attribute is only supported for Windows 7 and later.