WebAudio createBuffer should throw error with 0 channels.

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 ee3150b459ba3290479d20b5aaaf964c34c9d947..e01189dc5b19dc9d9bb18615ef240b67b5148a8e 100644
--- a/LayoutTests/webaudio/dom-exceptions-expected.txt
+++ b/LayoutTests/webaudio/dom-exceptions-expected.txt
@@ -2,12 +2,13 @@ Tests DOM exception messages
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
-PASS context.createBuffer(99, 1, context.sampleRate) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': requested number of channels (99) exceeds maximum (32).
-PASS context.createBuffer(1, 1, 1) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': requested sample rate (1) does not lie in the allowed range of 3000-192000 Hz.
-PASS context.createBuffer(1, 1, 1e6) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': requested sample rate (1.00000e+6) does not lie in the allowed range of 3000-192000 Hz.
+PASS context.createBuffer(99, 1, context.sampleRate) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': The number of channels provided (99) is outside the range [1, 32]..
+PASS context.createBuffer(0, 1, context.sampleRate) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': The number of channels provided (0) is outside the range [1, 32]..
+PASS context.createBuffer(1, 1, 1) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': The sample rate provided (1) is outside the range [3000, 192000]..
+PASS context.createBuffer(1, 1, 1e6) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': The sample rate provided (1.00000e+6) is outside the range [3000, 192000]..
 PASS context.createBuffer(1, 1, 3000) did not throw exception.
 PASS context.createBuffer(1, 1, 192000) did not throw exception.
-PASS context.createBuffer(1, 0, context.sampleRate) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': number of frames must be greater than 0..
+PASS context.createBuffer(1, 0, context.sampleRate) threw exception NotSupportedError: Failed to execute 'createBuffer' on 'AudioContext': The number of frames provided (0) is less than or equal to the minimum bound (0)..
 PASS context.createBuffer(new ArrayBuffer(100), true) threw exception TypeError: Failed to execute 'createBuffer' on 'AudioContext': 3 arguments required, but only 2 present..
 PASS context.decodeAudioData(null, function() {}, function () {}) threw exception SyntaxError: Failed to execute 'decodeAudioData' on 'AudioContext': invalid ArrayBuffer for audioData..
 PASS context.createMediaElementSource(null) threw exception InvalidStateError: Failed to execute 'createMediaElementSource' on 'AudioContext': invalid HTMLMedialElement..