Roll IDL to Dartium37 (r181268)

modules/webaudio/BiquadFilterNode.idl

Index: modules/webaudio/BiquadFilterNode.idl
diff --git a/modules/webaudio/BiquadFilterNode.idl b/modules/webaudio/BiquadFilterNode.idl
index 2422dfb1a985946b0c7122189bf6d8d93ff7c639..9783ab2a22b502f44c5d3782a4b784cf6c331d91 100644
--- a/modules/webaudio/BiquadFilterNode.idl
+++ b/modules/webaudio/BiquadFilterNode.idl
@@ -22,20 +22,21 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+enum BiquadFilterType {
+    "lowpass",
+    "highpass",
+    "bandpass",
+    "lowshelf",
+    "highshelf",
+    "peaking",
+    "notch",
+    "allpass"
+};
+
 [
     Conditional=WEB_AUDIO
 ] interface BiquadFilterNode : AudioNode {
-    // Filter type.
-    const unsigned short LOWPASS = 0;
-    const unsigned short HIGHPASS = 1;
-    const unsigned short BANDPASS = 2;
-    const unsigned short LOWSHELF = 3;
-    const unsigned short HIGHSHELF = 4;
-    const unsigned short PEAKING = 5;
-    const unsigned short NOTCH = 6;
-    const unsigned short ALLPASS = 7;
-
-    [Custom=Setter] attribute DOMString type;
+    attribute BiquadFilterType type;
 
     readonly attribute AudioParam frequency; // in Hertz
     readonly attribute AudioParam detune; // in Cents