[CodeHealth] Remove an unused function

This CL removes an un-used function in PaintRenderingContext2d

Bug: None
Change-Id: Idb16af53d2f63132576bff64973f39c6d91459af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050604Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740302}

third_party/blink/renderer/modules/csspaint/paint_rendering_context_2d.cc

@@ -45,12 +45,6 @@ void PaintRenderingContext2D::InitializePaintRecorder() {
   did_record_draw_commands_in_paint_recorder_ = false;
 }
 
-cc::PaintCanvas* PaintRenderingContext2D::Canvas() const {
-  DCHECK(paint_recorder_);
-  DCHECK(paint_recorder_->getRecordingCanvas());
-  return paint_recorder_->getRecordingCanvas();
-}
-
 void PaintRenderingContext2D::DidDraw(const SkIRect&) {
   did_record_draw_commands_in_paint_recorder_ = true;
 }

third_party/blink/renderer/modules/csspaint/paint_rendering_context_2d.h

@@ -95,7 +95,6 @@ class MODULES_EXPORT PaintRenderingContext2D : public ScriptWrappable,
 
  private:
   void InitializePaintRecorder();
-  cc::PaintCanvas* Canvas() const;
 
   std::unique_ptr<PaintRecorder> paint_recorder_;
   sk_sp<PaintRecord> previous_frame_;