Issue #21 - Remove Telemetry plumbing and fix build.

Note this won't give working applications. Requires FE changes and
additional js module changes (next part).

gfx/layers/apz/src/AsyncPanZoomController.h

@@ -228,14 +228,14 @@ public:
   uint32_t GetCheckerboardMagnitude() const;
 
   /**
-   * Report the number of CSSPixel-milliseconds of checkerboard to telemetry.
+   * Report the number of CSSPixel-milliseconds of checkerboard.
    */
   void ReportCheckerboard(const TimeStamp& aSampleTime);
 
   /**
    * Flush any active checkerboard report that's in progress. This basically
    * pretends like any in-progress checkerboard event has terminated, and pushes
-   * out the report to the checkerboard reporting service and telemetry. If the
+   * out the report to the checkerboard reporting service. If the
    * checkerboard event has not really finished, it will start a new event
    * on the next composite.
    */

gfx/layers/apz/src/CheckerboardEvent.h

@@ -157,8 +157,7 @@ private:
 private:
   /**
    * If true, we should log the various properties during the checkerboard
-   * event. If false, we only need to record things we need for telemetry
-   * measures.
+   * event.
    */
   const bool mRecordTrace;
   /**

gfx/layers/apz/src/InputBlockState.cpp

@@ -46,7 +46,7 @@ InputBlockState::SetConfirmedTargetApzc(const RefPtr<AsyncPanZoomController>& aT
       aState == TargetConfirmationState::eConfirmed) {
     // The main thread finally responded. We had already timed out the
     // confirmation, but we want to update the state internally so that we
-    // can record the time for telemetry purposes.
+    // can record the time.
     mTargetConfirmed = TargetConfirmationState::eTimedOutAndMainThreadResponded;
   }
   if (mTargetConfirmed != TargetConfirmationState::eUnconfirmed) {

gfx/layers/apz/src/InputBlockState.h

@@ -143,8 +143,7 @@ public:
 
   /**
    * This should be called when a content response notification has been
-   * delivered to this block. If all the notifications have arrived, this
-   * will report the total time take to telemetry.
+   * delivered to this block.
    */
   void RecordContentResponseTime();
 

gfx/layers/apz/util/ScrollInputMethods.h

@@ -11,7 +11,6 @@ namespace layers {
 
 /**
  * An enumeration that lists various input methods used to trigger scrolling.
- * Used as the values for the SCROLL_INPUT_METHODS telemetry histogram.
  */
 enum class ScrollInputMethod {