Enable webaudio unit tests iff ENABLE(WEB_AUDIO).

third_party/WebKit/Source/modules/webaudio/AudioBasicProcessorHandlerTest.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
+#if ENABLE(WEB_AUDIO)
 #include "modules/webaudio/AudioBasicProcessorHandler.h"
 
 #include "core/testing/DummyPageHolder.h"
 #include "modules/webaudio/OfflineAudioContext.h"
 #include "platform/audio/AudioProcessor.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 class MockAudioProcessor final : public AudioProcessor {
@@ skipping 29 matching lines @@
     EXPECT_TRUE(handler.processor()->isInitialized());
     AbstractAudioContext::AutoLocker locker(context);
     handler.dispose();
     // The AudioProcessor should live after dispose() and should not be
     // finalized because an audio thread is using it.
     EXPECT_TRUE(handler.processor());
     EXPECT_TRUE(handler.processor()->isInitialized());
 }
 
 } // namespace blink
+
+#endif // ENABLE(WEB_AUDIO)