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Change crash_service.exe so that the named pipe it listens on
(normally global) and the directory it writes to (normally per-user)
can both be overridden via command line options.

Similarly, add an environment variable to Chromium for connecting to
crash_service.exe via a non-default named pipe.

This will allow automated tests of Chromium's Breakpad crash reporting
to be more robust.  A test runner can use a temp dir for crashes and a
temporary named pipe, so that it does not have to worry about
pre-existing instances of crash_service.exe or pre-existing dump
files.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=2006
TEST=inbrowser_crash_test in the NaCl tree, with the change http://codereview.chromium.org/7569002

Review URL: http://codereview.chromium.org/7538036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95714 0039d316-1c4b-4281-b951-d872f2087c98