Delete all use of tick_util.h.

Depends on Chrome cl https://codereview.chromium.org/1888003002/, which was landed some time ago.

BUG=webrtc:5740
R=stefan@webrtc.org, tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1888593004 .

Cr-Commit-Position: refs/heads/master@{#12674}
diff --git a/webrtc/modules/audio_coding/test/APITest.cc b/webrtc/modules/audio_coding/test/APITest.cc
index a2506ba..25bacfd 100644
--- a/webrtc/modules/audio_coding/test/APITest.cc
+++ b/webrtc/modules/audio_coding/test/APITest.cc
@@ -21,13 +21,13 @@
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/base/platform_thread.h"
+#include "webrtc/base/timeutils.h"
 #include "webrtc/common.h"
 #include "webrtc/common_types.h"
 #include "webrtc/engine_configurations.h"
 #include "webrtc/modules/audio_coding/acm2/acm_common_defs.h"
 #include "webrtc/modules/audio_coding/test/utility.h"
 #include "webrtc/system_wrappers/include/event_wrapper.h"
-#include "webrtc/system_wrappers/include/tick_util.h"
 #include "webrtc/system_wrappers/include/trace.h"
 #include "webrtc/test/testsupport/fileutils.h"
 
@@ -560,7 +560,7 @@
   // Keep main thread waiting for sender/receiver
   // threads to complete
   EventWrapper* completeEvent = EventWrapper::Create();
-  uint64_t startTime = TickTime::MillisecondTimestamp();
+  uint64_t startTime = rtc::TimeMillis();
   uint64_t currentTime;
   // Run test in 2 minutes (120000 ms).
   do {
@@ -570,7 +570,7 @@
     }
     //fflush(stderr);
     completeEvent->Wait(50);
-    currentTime = TickTime::MillisecondTimestamp();
+    currentTime = rtc::TimeMillis();
   } while ((currentTime - startTime) < 120000);
 
   //completeEvent->Wait(0xFFFFFFFF);