Add mspdbcmf (un-fastlink) support to StripChromeSymbols.py
Add mspdbcmf (un-fastlink) support to StripChromeSymbols.py

When binaries are built with /debug:fastlink they are smaller and
require less copying of data, but they cannot be stripped by
pdbcopy.exe. This means that StripChromeSymbols.py fails with locally
built binaries if /debug:fastlink is used, which gets us back to
WPA taking ~25 minutes to process Chrome's symbols.

This change automatically runs mspdbcmf.exe (if present) if pdbcopy
fails. Hacks upon hacks upon hacks. All of this could be avoided if
WPA could load Chrome's symbols quickly. Someday...

This fixes issue #77

ariccio/UIforETW,ariccio/UIforETW,google/UIforETW,MikeMarcin/UIforETW,google/UIforETW,ariccio/UIforETW,MikeMarcin/UIforETW,mwinterb/UIforETW,google/UIforETW,mwinterb/UIforETW,ariccio/UIforETW,google/UIforETW,MikeMarcin/UIforETW,mwinterb/UIforETW