Removing #ifdefs for WEB_AUDIO compile time flag.

Source/config.gni

Index: Source/config.gni
diff --git a/Source/config.gni b/Source/config.gni
index aea6ee3c210e3b67aa344614286745b6ebd3c2fc..fb8c460c24f339396afc49084d7ef7edf8504d70 100644
--- a/Source/config.gni
+++ b/Source/config.gni
@@ -67,7 +67,6 @@ if (use_concatenated_impulse_responses) {
 if (!is_android) {
   feature_defines_list += [
     "ENABLE_INPUT_MULTIPLE_FIELDS_UI=1",
-    "ENABLE_WEB_AUDIO=1",
   ]
 }
 
@@ -80,7 +79,6 @@ if (use_openmax_dl_fft) {
     "WTF_USE_WEBAUDIO_OPENMAX_DL_FFT=1",
     # Enabling the FFT is enough to enable WebAudio support to
     # allow most WebAudio features to work on Android.
-    "ENABLE_WEB_AUDIO=1",
   ]
 }