Support AudioContextOptions latencyHint as double.

content/renderer/media/audio_renderer_mixer_manager_unittest.cc

Index: content/renderer/media/audio_renderer_mixer_manager_unittest.cc
diff --git a/content/renderer/media/audio_renderer_mixer_manager_unittest.cc b/content/renderer/media/audio_renderer_mixer_manager_unittest.cc
index 8ef3738fd959ee138571669bb9d87c96a912096d..b8a6759ecff0461942073a0db65eefbed32b3020 100644
--- a/content/renderer/media/audio_renderer_mixer_manager_unittest.cc
+++ b/content/renderer/media/audio_renderer_mixer_manager_unittest.cc
@@ -626,16 +626,10 @@ TEST_F(AudioRendererMixerManagerTest, MixerParamsLatencyPlayback) {
   // Expecting hardware sample rate
   EXPECT_EQ(44100, mixer->GetOutputParamsForTesting().sample_rate());
 
-// 20 ms at 44100 is 882 frames per buffer.
-#if defined(OS_WIN)
+  // 20 ms at 44100 is 882 frames per buffer.
   // Round up 882 to the nearest multiple of the output buffer size (128). which
   // is 7 * 128 = 896
   EXPECT_EQ(896, mixer->GetOutputParamsForTesting().frames_per_buffer());
-#else
-  // Round up 882 to the power of 2.
-  EXPECT_EQ(1024, mixer->GetOutputParamsForTesting().frames_per_buffer());
-#endif  // defined(OS_WIN)
-
 #endif  // defined(OS_CHROMEOS)
 
   ReturnMixer(mixer);
@@ -699,14 +693,9 @@ TEST_F(AudioRendererMixerManagerTest, MixerParamsLatencyPlaybackFakeAudio) {
   // Expecting input sample rate
   EXPECT_EQ(32000, mixer->GetOutputParamsForTesting().sample_rate());
 
-// 20 ms at 32000 is 640 frames per buffer.
-#if defined(OS_WIN)
+  // 20 ms at 32000 is 640 frames per buffer.
   // Use 20 ms buffer.
   EXPECT_EQ(640, mixer->GetOutputParamsForTesting().frames_per_buffer());
-#else
-  // Ignore device buffer size, round up 640 to the power of 2.
-  EXPECT_EQ(1024, mixer->GetOutputParamsForTesting().frames_per_buffer());
-#endif  // defined(OS_WIN)
 
   ReturnMixer(mixer);
 }