Update IDL to Chrome 32

modules/webaudio/AnalyserNode.idl

Index: modules/webaudio/AnalyserNode.idl
diff --git a/modules/webaudio/AnalyserNode.idl b/modules/webaudio/AnalyserNode.idl
index 27117e196d5a3b2452b3cdd6b49f48c0c8bd273f..f179f5e5ebef179b2618188b56de6ab659c07853 100644
--- a/modules/webaudio/AnalyserNode.idl
+++ b/modules/webaudio/AnalyserNode.idl
@@ -29,11 +29,11 @@
     readonly attribute unsigned long frequencyBinCount;
 
     // minDecibels / maxDecibels represent the range to scale the FFT analysis data for conversion to unsigned byte values.
-    attribute float minDecibels;
-    attribute float maxDecibels;
+    [SetterRaisesException] attribute float minDecibels;
+    [SetterRaisesException] attribute float maxDecibels;
 
     // A value from 0.0 -> 1.0 where 0.0 represents no time averaging with the last analysis frame.
-    attribute float smoothingTimeConstant;
+    [SetterRaisesException] attribute float smoothingTimeConstant;
 
     // Copies the current frequency data into the passed array.
     // If the array has fewer elements than the frequencyBinCount, the excess elements will be dropped.