Add a feature to the HostResolverRules to be able to match rules only...

Add a feature to the HostResolverRules to be able to match rules only
for a specific port.  This allows me to alter resolutions for certain ports
like send :80 lookups to one location and :443 lookups to a different
location.

This enables me to mock out support for AlternateProtocol.

BUG=none
TEST=HostMappingRulesTest.PortSpecificMatching


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=56970

[eroman, 2010-08-20 18:25:00]

lgtm

http://codereview.chromium.org/3177026/diff/1/3
File net/base/host_mapping_rules_unittest.cc (right):

http://codereview.chromium.org/3177026/diff/1/3#newcode43
net/base/host_mapping_rules_unittest.cc:43: "map *.com:80 baz:111 , map
*.com:443 blat:333, EXCLUDE *.foo.com");
nit: indent continued lines by 4.

http://codereview.chromium.org/3177026/diff/1/3#newcode58
net/base/host_mapping_rules_unittest.cc:58: host_port = HostPortPair("wtf.com",
443);
heh, colorful hostnames :)