Update WebAudio layout tests to use unprefixed AudioContext.

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 df3ce2bea024f6984b31ba71977094b0091c716d..96cbd298a860aa9db741b3570df08631441c339e 100644
--- a/LayoutTests/webaudio/dom-exceptions-expected.txt
+++ b/LayoutTests/webaudio/dom-exceptions-expected.txt
@@ -41,10 +41,10 @@ PASS node.channelCount = 99 threw exception NotSupportedError: Failed to set the
 PASS node.channelCountMode = mode threw exception InvalidStateError: Failed to set the 'channelCountMode' property on 'AudioNode': invalid mode 'fancy'; must be 'max', 'clamped-max', or 'explicit'..
 PASS node.channelInterpretation = mode threw exception InvalidStateError: Failed to set the 'channelInterpretation' property on 'AudioNode': invalid interpretation 'fancy'; must be 'speakers' or 'discrete'..
 PASS context.destination.channelCount = 99 threw exception IndexSizeError: Failed to set the 'channelCount' property on 'AudioNode': The channel count provided (99) is outside the range [1, 2]..
-PASS new webkitOfflineAudioContext(99, 100, context.sampleRate) threw exception SyntaxError: Failed to construct 'OfflineAudioContext': number of channels (99) exceeds maximum (10)..
-PASS new webkitOfflineAudioContext(1, 100, 1) threw exception SyntaxError: Failed to construct 'OfflineAudioContext': sample rate (1) must be in the range 44100-96000 Hz..
-PASS new webkitOfflineAudioContext(1, 100, 1e6) threw exception SyntaxError: Failed to construct 'OfflineAudioContext': sample rate (1.00000e+6) must be in the range 44100-96000 Hz..
-PASS new webkitOfflineAudioContext(1, -88200000000000, 44100) threw exception NotSupportedError: Failed to construct 'OfflineAudioContext': OfflineAudioContext(1, 1448390656, 44100).
+PASS new OfflineAudioContext(99, 100, context.sampleRate) threw exception SyntaxError: Failed to construct 'OfflineAudioContext': number of channels (99) exceeds maximum (10)..
+PASS new OfflineAudioContext(1, 100, 1) threw exception SyntaxError: Failed to construct 'OfflineAudioContext': sample rate (1) must be in the range 44100-96000 Hz..
+PASS new OfflineAudioContext(1, 100, 1e6) threw exception SyntaxError: Failed to construct 'OfflineAudioContext': sample rate (1.00000e+6) must be in the range 44100-96000 Hz..
+PASS new OfflineAudioContext(1, -88200000000000, 44100) threw exception NotSupportedError: Failed to construct 'OfflineAudioContext': OfflineAudioContext(1, 1448390656, 44100).
 PASS node.oversample = '9x' threw exception InvalidStateError: Failed to set the 'oversample' property on 'WaveShaperNode': The value provided ('9x') is not one of 'none', '2x', or '4x'..
 PASS source = context.createBufferSource() did not throw exception.
 PASS source.buffer = buffer did not throw exception.
@@ -73,7 +73,7 @@ PASS osc1.start() did not throw exception.
 PASS osc1.stop() did not throw exception.
 PASS node.gain.exponentialRampToValueAtTime(-1, 0.1) threw exception InvalidStateError: Failed to execute 'exponentialRampToValueAtTime' on 'AudioParam': Target value for exponential ramp must be positive: -1.
 PASS node.gain.exponentialRampToValueAtTime(0, 0.1) threw exception InvalidStateError: Failed to execute 'exponentialRampToValueAtTime' on 'AudioParam': Target value for exponential ramp must be positive: 0.
-PASS oc = new webkitOfflineAudioContext(1, 44100, 44100) did not throw exception.
+PASS oc = new OfflineAudioContext(1, 44100, 44100) did not throw exception.
 PASS conv = oc.createConvolver() did not throw exception.
 PASS conv.buffer = oc.createBuffer(1, 100, 22050) threw exception NotSupportedError: Failed to set the 'buffer' property on 'ConvolverNode': The buffer sample rate of 22050 does not match the context rate of 44100 Hz..
 PASS successfullyParsed is true