Remove the explicit bypass rule for 127.0.0.0/8 used by DRP.

It is no longer necessary as ProxyBypassRules now implicitly bypasses loopback addresses.

Change-Id: Ia6c480870458e63a70e6ba753137f9169d58ba9e
Reviewed-on: https://chromium-review.googlesource.com/c/1327143Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606610}

components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc

@@ -657,14 +657,14 @@ void DataReductionProxyConfig::ContinueNetworkChanged(
 
 void DataReductionProxyConfig::AddDefaultProxyBypassRules() {
   DCHECK(configurator_);
+  // Under the hood we use an instance of ProxyBypassRules to evaluate these
+  // rules. ProxyBypassRules implicitly bypasses localhost, loopback, and
+  // link-local addresses, so it is not necessary to explicitly add them here.
+  // See ProxyBypassRules::MatchesImplicitRules() for details.
   configurator_->SetBypassRules(
       // localhost
       "<local>,"
 
-      // RFC6890 loopback addresses.
-      // TODO(tbansal): Remove this once crbug/446705 is fixed.
-      "127.0.0.0/8,"
-
       // RFC6890 current network (only valid as source address).
       "0.0.0.0/8,"