Move utility functions for sample rate to AudioUtilities.

Source/modules/webaudio/AudioContext.cpp

Index: Source/modules/webaudio/AudioContext.cpp
diff --git a/Source/modules/webaudio/AudioContext.cpp b/Source/modules/webaudio/AudioContext.cpp
index 760fa698450453492c506872a7fa9386eb38e033..68dc0a36e356bee16c7e55c18b898232e16fe41f 100644
--- a/Source/modules/webaudio/AudioContext.cpp
+++ b/Source/modules/webaudio/AudioContext.cpp
@@ -78,11 +78,6 @@ const WTF::ThreadIdentifier UndefinedThreadIdentifier = 0xffffffff;
 
 namespace blink {
 
-bool AudioContext::isSampleRateRangeGood(float sampleRate)
-{
-    return sampleRate >= AudioBuffer::minAllowedSampleRate() && sampleRate <= AudioBuffer::maxAllowedSampleRate();
-}
-
 // Don't allow more than this number of simultaneous AudioContexts talking to hardware.
 const unsigned MaxHardwareContexts = 6;
 unsigned AudioContext::s_hardwareContextCount = 0;