Delete zoomed_viewport_offset_ and its users.

cc/pinch_zoom_viewport.h

Index: cc/pinch_zoom_viewport.h
diff --git a/cc/pinch_zoom_viewport.h b/cc/pinch_zoom_viewport.h
index 9efe38667345bcbece241c50e5f493250ebe1319..52a4186217022dd54b3b3aef37cb9440a86d34ad 100644
--- a/cc/pinch_zoom_viewport.h
+++ b/cc/pinch_zoom_viewport.h
@@ -11,10 +11,6 @@
 
 namespace cc {
 
-// PinchZoomViewport models the bounds and offset of the viewport that is used
-// during a pinch-zoom operation. It tracks the layout-space dimensions of the
-// viewport before any applied scale, and then tracks the layout-space
-// coordinates of the viewport respecting the pinch settings.
 class CC_EXPORT PinchZoomViewport {
  public:
   PinchZoomViewport();
@@ -47,15 +43,6 @@ class CC_EXPORT PinchZoomViewport {
                                    float min_page_scale_factor,
                                    float max_page_scale_factor);
 
-  // Returns the zoomed viewport in layout space. The rect's position is an
-  // offset from the root layer's scroll position (therefore, zero if fully
-  // zoomed out).
-  gfx::RectF ZoomedViewport() const;
-
-  const gfx::Vector2dF& zoomed_viewport_offset() const {
-    return zoomed_viewport_offset_;
-  }
-
   void set_layout_viewport_size(const gfx::SizeF& size) {
     layout_viewport_size_ = size;
   }
@@ -66,16 +53,9 @@ class CC_EXPORT PinchZoomViewport {
     device_viewport_size_ = size;
   }
 
-  // Apply the scroll offset in layout space to the offset of the pinch-zoom
-  // viewport. The viewport cannot be scrolled outside of the layout viewport
-  // bounds. Returns the component of the scroll that is un-applied due to this
-  // constraint.
-  gfx::Vector2dF ApplyScroll(const gfx::Vector2dF);
-
-  // The implTransform goes from the origin of the unzoomedDeviceViewport to the
-  // origin of the zoomedDeviceViewport.
+  // The implTransform applies the page scale transformation.
   //
-  // implTransform = S[pageScale] * Tr[-zoomedDeviceViewportOffset]
+  // implTransform = S[pageScaleFactor] * S[pageScaleDelta]
   gfx::Transform ImplTransform(bool page_scale_pinch_zoom_enabled) const;
 
  private:
@@ -86,7 +66,6 @@ class CC_EXPORT PinchZoomViewport {
   float min_page_scale_factor_;
   float device_scale_factor_;
 
-  gfx::Vector2dF zoomed_viewport_offset_;
   gfx::SizeF layout_viewport_size_;
   gfx::SizeF device_viewport_size_;
 };