Use container::back() and container::pop_back().

cc/output/gl_renderer.cc

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/gl_renderer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 3652 matching lines @@
     unsigned filter = GL_LINEAR;
     gl_->ScheduleCALayerCHROMIUM(
         texture_id, contents_rect, ca_layer_overlay.opacity,
         ca_layer_overlay.background_color, ca_layer_overlay.edge_aa_mask,
         bounds_rect, is_clipped, clip_rect, sorting_context_id, transform,
         filter);
   }
 }
 
 void GLRenderer::ScheduleOverlays(DrawingFrame* frame) {
-  if (!frame->overlay_list.size())
+  if (frame->overlay_list.empty())
     return;
 
   OverlayCandidateList& overlays = frame->overlay_list;
   for (const OverlayCandidate& overlay : overlays) {
     unsigned texture_id = 0;
     if (overlay.use_output_surface_for_resource) {
       texture_id = output_surface_->GetOverlayTextureId();
       DCHECK(texture_id || IsContextLost());
     } else {
       pending_overlay_resources_.push_back(
           base::WrapUnique(new ResourceProvider::ScopedReadLockGL(
               resource_provider_, overlay.resource_id)));
       texture_id = pending_overlay_resources_.back()->texture_id();
     }
 
     context_support_->ScheduleOverlayPlane(
         overlay.plane_z_order, overlay.transform, texture_id,
         ToNearestRect(overlay.display_rect), overlay.uv_rect);
   }
 }
 
 }  // namespace cc