Remove ProxyResolver::(Cancel)SetPacScript and LegacyProxyResolverFactory.

net/http/http_network_transaction_unittest.cc

Index: net/http/http_network_transaction_unittest.cc
diff --git a/net/http/http_network_transaction_unittest.cc b/net/http/http_network_transaction_unittest.cc
index fcfba01eae71b75ce542a8f3994059b2529ca9ed..7c8853f1e2dd7c24dbefdf263f8867b5000e9abe 100644
--- a/net/http/http_network_transaction_unittest.cc
+++ b/net/http/http_network_transaction_unittest.cc
@@ -9511,7 +9511,7 @@ TEST_P(HttpNetworkTransactionTest, StallAlternateProtocolForNpnSpdy) {
 
 class CapturingProxyResolver : public ProxyResolver {
  public:
-  CapturingProxyResolver() : ProxyResolver(false /* expects_pac_bytes */) {}
+  CapturingProxyResolver() {}
   ~CapturingProxyResolver() override {}
 
   int GetProxyForURL(const GURL& url,
@@ -9533,13 +9533,6 @@ class CapturingProxyResolver : public ProxyResolver {
     return LOAD_STATE_IDLE;
   }
 
-  void CancelSetPacScript() override { NOTREACHED(); }
-
-  int SetPacScript(const scoped_refptr<ProxyResolverScriptData>&,
-                   const CompletionCallback& /*callback*/) override {
-    return OK;
-  }
-
   const std::vector<GURL>& resolved() const { return resolved_; }
 
  private: