Remove unused return value from QuicAlarm::Delegate::OnAlarm. No behavior change, not protected.

net/quic/quic_chromium_connection_helper_test.cc

 // Copyright (c) 2012 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 "net/quic/quic_chromium_connection_helper.h"
 
 #include "net/quic/test_tools/mock_clock.h"
 #include "net/quic/test_tools/mock_random.h"
 #include "net/quic/test_tools/test_task_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 namespace {
 
 class TestDelegate : public QuicAlarm::Delegate {
  public:
   TestDelegate() : fired_(false) {}
 
-  QuicTime OnAlarm() override {
-    fired_ = true;
-    return QuicTime::Zero();
-  }
+  void OnAlarm() override { fired_ = true; }
 
   bool fired() const { return fired_; }
   void Clear() { fired_ = false; }
 
  private:
   bool fired_;
 };
 
 class QuicChromiumConnectionHelperTest : public ::testing::Test {
  protected:
@@ skipping 146 matching lines @@
   EXPECT_TRUE(alarm->IsSet());
 
   // Update it with an uninitialized time and ensure it's cancelled.
   alarm->Update(QuicTime::Zero(), QuicTime::Delta::FromMicroseconds(1));
   EXPECT_FALSE(alarm->IsSet());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net