Make HttpNetworkSession::host_mapping_rules no longer a pointer.

net/base/host_mapping_rules.h

Index: net/base/host_mapping_rules.h
diff --git a/net/base/host_mapping_rules.h b/net/base/host_mapping_rules.h
index 8c7bc0bf92e99471fbd87414242aa304ccce5ebb..02aef4369b2bef13f50ca9290cd326621cb1ed75 100644
--- a/net/base/host_mapping_rules.h
+++ b/net/base/host_mapping_rules.h
@@ -18,8 +18,11 @@ class HostPortPair;
 class NET_EXPORT_PRIVATE HostMappingRules {
  public:
   HostMappingRules();
+  HostMappingRules(const HostMappingRules& host_mapping_rules);
   ~HostMappingRules();
 
+  HostMappingRules& operator=(const HostMappingRules& host_mapping_rules);
+
   // Modifies |*host_port| based on the current rules. Returns true if
   // |*host_port| was modified, false otherwise.
   bool RewriteHost(HostPortPair* host_port) const;
@@ -46,8 +49,6 @@ class NET_EXPORT_PRIVATE HostMappingRules {
 
   MapRuleList map_rules_;
   ExclusionRuleList exclusion_rules_;
-
-  DISALLOW_COPY_AND_ASSIGN(HostMappingRules);
 };
 
 }  // namespace net