Removing #ifdefs for WEB_AUDIO compile time flag.

Source/modules/webaudio/ChannelMergerNode.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 10 matching lines @@
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
-#if ENABLE(WEB_AUDIO)
-
 #include "modules/webaudio/ChannelMergerNode.h"
 
 #include "modules/webaudio/AudioContext.h"
 #include "modules/webaudio/AudioNodeInput.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 
 const unsigned DefaultNumberOfOutputChannels = 1;
 
 namespace blink {
 
@@ skipping 82 matching lines @@
     output->setNumberOfChannels(numberOfOutputChannels);
     // There can in rare cases be a slight delay before the output bus is updated to the new number of
     // channels because of tryLocks() in the context's updating system. So record the new number of
     // output channels here.
     m_desiredNumberOfOutputChannels = numberOfOutputChannels;
 
     AudioNode::checkNumberOfChannelsForInput(input);
 }
 
 } // namespace blink
-
-#endif // ENABLE(WEB_AUDIO)