Replace DCHECK with ASSERT_TRUE in vie_encoder_unittest.cc

BUG=none
TBR=sprang@webrtc.org

Review-Url: https://codereview.webrtc.org/2699593007
Cr-Commit-Position: refs/heads/master@{#16656}
diff --git a/webrtc/video/vie_encoder_unittest.cc b/webrtc/video/vie_encoder_unittest.cc
index 380c4fa..faa4833 100644
--- a/webrtc/video/vie_encoder_unittest.cc
+++ b/webrtc/video/vie_encoder_unittest.cc
@@ -78,7 +78,7 @@
       down ? AdaptDown(reason) : AdaptUp(reason);
       event.Set();
     });
-    RTC_DCHECK(event.Wait(5000));
+    ASSERT_TRUE(event.Wait(5000));
   }
 
   void TriggerCpuOveruse() { PostTaskAndWait(true, AdaptReason::kCpu); }