Fix attributes types on AnalyserNode as specification of web audio.

LayoutTests/webaudio/dom-exceptions-expected.txt

Index: LayoutTests/webaudio/dom-exceptions-expected.txt
diff --git a/LayoutTests/webaudio/dom-exceptions-expected.txt b/LayoutTests/webaudio/dom-exceptions-expected.txt
index 501ba5eaa9299e1f6e3e0fce8918910563033685..3d14ea9a7d573171a2c488da24e51344726f7c34 100644
--- a/LayoutTests/webaudio/dom-exceptions-expected.txt
+++ b/LayoutTests/webaudio/dom-exceptions-expected.txt
@@ -30,6 +30,8 @@ PASS node.fftSize = 16 threw exception IndexSizeError: Failed to set the 'fftSiz
 PASS node.fftSize = 4096 threw exception IndexSizeError: Failed to set the 'fftSize' property on 'AnalyserNode': The FFT size provided (4096) is outside the range [32, 2048]..
 PASS node.minDecibels = -10 threw exception IndexSizeError: Failed to set the 'minDecibels' property on 'AnalyserNode': The minDecibels provided (-10) is greater than the maximum bound (-30)..
 PASS node.maxDecibels = -150 threw exception IndexSizeError: Failed to set the 'maxDecibels' property on 'AnalyserNode': The maxDecibels provided (-150) is less than the minimum bound (-100)..
+PASS node.minDecibels = -30 threw exception IndexSizeError: Failed to set the 'minDecibels' property on 'AnalyserNode': The minDecibels provided (-30) is greater than or equal to the maximum bound (-30)..
+PASS node.maxDecibels = -100 threw exception IndexSizeError: Failed to set the 'maxDecibels' property on 'AnalyserNode': The maxDecibels provided (-100) is less than or equal to the minimum bound (-100)..
 PASS node.smoothingTimeConstant = -0.1 threw exception IndexSizeError: Failed to set the 'smoothingTimeConstant' property on 'AnalyserNode': The smoothing value provided (-0.1) is outside the range [0, 1]..
 PASS node.smoothingTimeConstant = 1.5 threw exception IndexSizeError: Failed to set the 'smoothingTimeConstant' property on 'AnalyserNode': The smoothing value provided (1.5) is outside the range [0, 1]..
 PASS node.getChannelData(2) threw exception IndexSizeError: Failed to execute 'getChannelData' on 'AudioBuffer': channel index (2) exceeds number of channels (1).