Fix QuicAllowedPolicyDynamicTest browser_tests failures

chrome/browser/policy/policy_network_browsertest.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
@@ skipping 177 matching lines @@
  public:
   QuicAllowedPolicyDynamicTest()
       : InProcessBrowserTest(), profile_1_(nullptr), profile_2_(nullptr) {}
 
  protected:
   void SetUpCommandLine(base::CommandLine* command_line) override {
 #if defined(OS_CHROMEOS)
     command_line->AppendSwitch(
         chromeos::switches::kIgnoreUserProfileMappingForTests);
 #endif
+    // Ensure that QUIC is enabled by default on browser startup.
+    command_line->AppendSwitch(switches::kEnableQuic);
   }
 
   void SetUpInProcessBrowserTestFixture() override {
     // Set the overriden policy provider for the first Profile (profile_1_).
     EXPECT_CALL(policy_for_profile_1_, IsInitializationComplete(testing::_))
         .WillRepeatedly(testing::Return(true));
     policy::ProfilePolicyConnectorFactory::GetInstance()
         ->PushProviderForTesting(&policy_for_profile_1_);
   }
 
@@ skipping 196 matching lines @@
 
   // Disable QUIC in second profile
   SetQuicAllowedPolicy(policy_for_profile_2(), false);
   EXPECT_FALSE(IsQuicEnabled(system_request_context()));
   EXPECT_FALSE(IsQuicEnabled(safe_browsing_service_request_context()));
   EXPECT_FALSE(IsQuicEnabled(profile_1()->GetRequestContext()));
   EXPECT_FALSE(IsQuicEnabled(profile_2()->GetRequestContext()));
 }
 
 }  // namespace policy