Split out QuicAlarm creation from QuicConnectionHelper to new QuicAlarmFactory.

net/quic/quic_chromium_connection_helper.h

Index: net/quic/quic_chromium_connection_helper.h
diff --git a/net/quic/quic_chromium_connection_helper.h b/net/quic/quic_chromium_connection_helper.h
index 281a3f365f7e6f83b0c363a7bc0f46925d0cdd57..cc64a76d29da8541d1bc75f7b699a2df317026fb 100644
--- a/net/quic/quic_chromium_connection_helper.h
+++ b/net/quic/quic_chromium_connection_helper.h
@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// The Chrome-specific helper for QuicConnection which uses
-// a TaskRunner for alarms, and uses a DatagramClientSocket for writing data.
+// The Chrome-specific helper for QuicConnection
 
 #ifndef NET_QUIC_QUIC_CONNECTION_HELPER_H_
 #define NET_QUIC_QUIC_CONNECTION_HELPER_H_
@@ -31,22 +30,16 @@ class QuicRandom;
 class NET_EXPORT_PRIVATE QuicChromiumConnectionHelper
     : public QuicConnectionHelperInterface {
  public:
-  QuicChromiumConnectionHelper(base::TaskRunner* task_runner,
-                               const QuicClock* clock,
+  QuicChromiumConnectionHelper(const QuicClock* clock,
                                QuicRandom* random_generator);
   ~QuicChromiumConnectionHelper() override;
 
   // QuicConnectionHelperInterface
   const QuicClock* GetClock() const override;
   QuicRandom* GetRandomGenerator() override;
-  QuicAlarm* CreateAlarm(QuicAlarm::Delegate* delegate) override;
-  QuicArenaScopedPtr<QuicAlarm> CreateAlarm(
-      QuicArenaScopedPtr<QuicAlarm::Delegate> delegate,
-      QuicConnectionArena* arena) override;
   QuicBufferAllocator* GetBufferAllocator() override;
 
  private:
-  base::TaskRunner* task_runner_;
   const QuicClock* clock_;
   QuicRandom* random_generator_;
   SimpleBufferAllocator buffer_allocator_;