IVGCVSW-1821 - taking out scale factor again as it's polluting the WallClockTimer interface

Change-Id: Ia90b709ddfff321dbc218add4ab19737f68a44bf
diff --git a/src/armnn/WallClockTimer.hpp b/src/armnn/WallClockTimer.hpp
index 09cc514..88cbb4d 100644
--- a/src/armnn/WallClockTimer.hpp
+++ b/src/armnn/WallClockTimer.hpp
@@ -25,7 +25,7 @@
     }
 };
 
-// Implementation of an instrument to measure elapsed wall-clock time in milliseconds.
+// Implementation of an instrument to measure elapsed wall-clock time in microseconds.
 class WallClockTimer : public Instrument
 {
 public:
@@ -42,8 +42,6 @@
     // Get the name of the timer
     const char* GetName() const override;
 
-    void SetScaleFactor(Measurement::Unit measurementUnit);
-
     // Get the recorded measurements
     std::vector<Measurement> GetMeasurements() const override;
 
@@ -60,8 +58,6 @@
 private:
     clock::time_point m_Start;
     clock::time_point m_Stop;
-    float m_ScaleFactor = 1.f;
-    Measurement::Unit m_Unit = Measurement::Unit::TIME_MS;
 };
 
 } //namespace armnn