[Code Health] Remove an un-necessary blank line in LTHI.cc

TBR=weiliangc@chromium.org

Bug: None
Change-Id: Ibfcf6f2a11cd4e839d4bacbc26b25cccc0d3ebb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041796Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738991}

cc/trees/layer_tree_host_impl.cc

@@ -2327,7 +2327,6 @@ bool LayerTreeHostImpl::DrawLayers(FrameData* frame) {
         frame->begin_frame_ack, frame->origin_begin_main_frame_args);
   }
 
-
   if (!mutator_host_->NextFrameHasPendingRAF())
     frame_trackers_.StopSequence(FrameSequenceTrackerType::kRAF);