Switch to literals in playout delay tests

It is important that these numbers do not change, so instead of
referring to constants we will use literals here. If we need to update
them we will simply have to update this test as well.

Bug: webrtc:7452
Change-Id: I2808ef08d2236c10666258a8670cc2fd08543143
Reviewed-on: https://webrtc-review.googlesource.com/c/114160
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Paulina Hensman <phensman@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25991}

sdk/android/native_unittests/audio_device/audio_device_unittest.cc

@@ -746,13 +746,13 @@ TEST_F(AudioDeviceTest,
 // verifies that the audio device reports correct delay estimate given the
 // selected audio layer. Note that, this delay estimate will only be utilized
 // if the HW AEC is disabled.
+// Delay should be 75 ms in high latency and 25 ms in low latency.
 TEST_F(AudioDeviceTest, UsesCorrectDelayEstimateForHighLatencyOutputPath) {
-  EXPECT_EQ(kHighLatencyModeDelayEstimateInMilliseconds / 2,
-            TestDelayOnAudioLayer(AudioDeviceModule::kAndroidJavaAudio));
+  EXPECT_EQ(75, TestDelayOnAudioLayer(AudioDeviceModule::kAndroidJavaAudio));
 }
 
 TEST_F(AudioDeviceTest, UsesCorrectDelayEstimateForLowLatencyOutputPath) {
-  EXPECT_EQ(kLowLatencyModeDelayEstimateInMilliseconds / 2,
+  EXPECT_EQ(25,
             TestDelayOnAudioLayer(
                 AudioDeviceModule::kAndroidJavaInputAndOpenSLESOutputAudio));
 }