Remove ProxyResolver::(Cancel)SetPacScript and LegacyProxyResolverFactory.

net/proxy/proxy_resolver_mac.cc

Index: net/proxy/proxy_resolver_mac.cc
diff --git a/net/proxy/proxy_resolver_mac.cc b/net/proxy/proxy_resolver_mac.cc
index 521bd6a7a4a7c34054cb5611ff91256caa2e0fd1..df438d198283bac837007dce93a669d12b7db087 100644
--- a/net/proxy/proxy_resolver_mac.cc
+++ b/net/proxy/proxy_resolver_mac.cc
@@ -80,18 +80,13 @@ class ProxyResolverMac : public ProxyResolver {
 
   LoadState GetLoadState(RequestHandle request) const override;
 
-  void CancelSetPacScript() override;
-
-  int SetPacScript(const scoped_refptr<ProxyResolverScriptData>& script_data,
-                   const CompletionCallback& /*callback*/) override;
-
  private:
   const scoped_refptr<ProxyResolverScriptData> script_data_;
 };
 
 ProxyResolverMac::ProxyResolverMac(
     const scoped_refptr<ProxyResolverScriptData>& script_data)
-    : ProxyResolver(false /*expects_pac_bytes*/), script_data_(script_data) {
+    : script_data_(script_data) {
 }
 
 ProxyResolverMac::~ProxyResolverMac() {}
@@ -215,17 +210,6 @@ LoadState ProxyResolverMac::GetLoadState(RequestHandle request) const {
   return LOAD_STATE_IDLE;
 }
 
-void ProxyResolverMac::CancelSetPacScript() {
-  NOTREACHED();
-}
-
-int ProxyResolverMac::SetPacScript(
-    const scoped_refptr<ProxyResolverScriptData>& script_data,
-    const CompletionCallback& /*callback*/) {
-  NOTREACHED();
-  return ERR_NOT_IMPLEMENTED;
-}
-
 }  // namespace
 
 ProxyResolverFactoryMac::ProxyResolverFactoryMac()