Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

Source/modules/webaudio/OscillatorNode.h

Index: Source/modules/webaudio/OscillatorNode.h
diff --git a/Source/modules/webaudio/OscillatorNode.h b/Source/modules/webaudio/OscillatorNode.h
index 51701eba85726c4d043d8d0dae90d26b38408cc5..f8ea1e725f85faba68a272d5d4819f143af8808d 100644
--- a/Source/modules/webaudio/OscillatorNode.h
+++ b/Source/modules/webaudio/OscillatorNode.h
@@ -55,7 +55,7 @@ public:
     static PassRefPtr<OscillatorNode> create(AudioContext*, float sampleRate);
 
     virtual ~OscillatorNode();
-    
+
     // AudioNode
     virtual void process(size_t framesToProcess);
     virtual void reset();
@@ -80,7 +80,7 @@ private:
 
     // One of the waveform types defined in the enum.
     unsigned short m_type;
-    
+
     // Frequency value in Hertz.
     RefPtr<AudioParam> m_frequency;
 
@@ -99,7 +99,7 @@ private:
     // Stores sample-accurate values calculated according to frequency and detune.
     AudioFloatArray m_phaseIncrements;
     AudioFloatArray m_detuneValues;
-    
+
     RefPtr<PeriodicWave> m_periodicWave;
 
     // Cache the wave tables for different waveform types, except CUSTOM.