Code:  void Layer::SetScrollOffset(gfx::Vector2d scroll_offset) {
   DCHECK(IsPropertyChangeAllowed());
 
  if (layer_tree_host()) {
    scroll_offset = layer_tree_host()->DistributeScrollOffsetToViewports(
        scroll_offset, this);
  }
   if (scroll_offset_ == scroll_offset)
     return;
   scroll_offset_ = scroll_offset;
  SetNeedsCommit();
}

Commit Message: Removed pinch viewport scroll offset distribution

The associated change in Blink makes the pinch viewport a proper
ScrollableArea meaning the normal path for synchronizing layer scroll
offsets is used.

This is a 2 sided patch, the other CL:
https://codereview.chromium.org/199253002/

BUG=349941

Review URL: https://codereview.chromium.org/210543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260105 0039d316-1c4b-4281-b951-d872f2087c98
CWE ID: CWE-399
 void Layer::SetScrollOffset(gfx::Vector2d scroll_offset) {
   DCHECK(IsPropertyChangeAllowed());
 
   if (scroll_offset_ == scroll_offset)
     return;
   scroll_offset_ = scroll_offset;
  SetNeedsCommit();
}
