Access current frame counter carefully and remove m_cachedSampleFrame.

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 845d729fa5598817b70e1853536a9758697f6fdb..a6e0aebbeeab2c4dc1278d17ec43f392fd25f5df 100644
--- a/Source/modules/webaudio/AudioContext.cpp
+++ b/Source/modules/webaudio/AudioContext.cpp
@@ -109,7 +109,6 @@ AudioContext::AudioContext(Document* document)
     , m_deferredTaskHandler(DeferredTaskHandler::create())
     , m_isOfflineContext(false)
     , m_contextState(Suspended)
-    , m_cachedSampleFrame(0)
 {
     m_didInitializeContextGraphMutex = true;
     m_destinationNode = DefaultAudioDestinationNode::create(this);
@@ -130,7 +129,6 @@ AudioContext::AudioContext(Document* document, unsigned numberOfChannels, size_t
     , m_deferredTaskHandler(DeferredTaskHandler::create())
     , m_isOfflineContext(true)
     , m_contextState(Suspended)
-    , m_cachedSampleFrame(0)
 {
     m_didInitializeContextGraphMutex = true;
     // Create a new destination for offline rendering.
@@ -679,22 +677,6 @@ PeriodicWave* AudioContext::createPeriodicWave(DOMFloat32Array* real, DOMFloat32
     return PeriodicWave::create(sampleRate(), real, imag);
 }
 
-size_t AudioContext::currentSampleFrame() const
-{
-    if (isAudioThread())
-        return m_destinationNode ? m_destinationNode->audioDestinationHandler().currentSampleFrame() : 0;
-
-    return m_cachedSampleFrame;
-}
-
-double AudioContext::currentTime() const
-{
-    if (isAudioThread())
-        return m_destinationNode ? m_destinationNode->audioDestinationHandler().currentTime() : 0;
-
-    return m_cachedSampleFrame / static_cast<double>(sampleRate());
-}
-
 String AudioContext::state() const
 {
     // These strings had better match the strings for AudioContextState in AudioContext.idl.
@@ -880,9 +862,6 @@ void AudioContext::handlePreRenderTasks()
         // Check to see if source nodes can be stopped because the end time has passed.
         handleStoppableSourceNodes();
 
-        // Update the cached sample frame value.
-        m_cachedSampleFrame = currentSampleFrame();
-
         unlock();
     }
 }