Use .empty() instead of checking .size() == 0 when converting from .isEmpty().

cc/CCLayerTreeHostImpl.cpp

 // Copyright 2011 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 "config.h"
 
 #include "CCLayerTreeHostImpl.h"
 
 #include "base/basictypes.h"
 #include "CCAppendQuadsData.h"
@@ skipping 246 matching lines @@
 
 void CCLayerTreeHostImpl::FrameData::appendRenderPass(scoped_ptr<CCRenderPass> renderPass)
 {
     CCRenderPass* pass = renderPass.get();
     renderPasses.push_back(pass);
     renderPassesById.set(pass->id(), renderPass.Pass());
 }
 
 bool CCLayerTreeHostImpl::calculateRenderPasses(FrameData& frame)
 {
-    ASSERT(!frame.renderPasses.size());
+    ASSERT(frame.renderPasses.empty());
 
     calculateRenderSurfaceLayerList(*frame.renderSurfaceLayerList);
 
     TRACE_EVENT1("cc", "CCLayerTreeHostImpl::calculateRenderPasses", "renderSurfaceLayerList.size()", static_cast<long long unsigned>(frame.renderSurfaceLayerList->size()));
 
     // Create the render passes in dependency order.
     for (int surfaceIndex = frame.renderSurfaceLayerList->size() - 1; surfaceIndex >= 0 ; --surfaceIndex) {
         CCLayerImpl* renderSurfaceLayer = (*frame.renderSurfaceLayerList)[surfaceIndex];
         renderSurfaceLayer->renderSurface()->appendRenderPasses(frame);
     }
@@ skipping 271 matching lines @@
 
 void CCLayerTreeHostImpl::onVSyncParametersChanged(double monotonicTimebase, double intervalInSeconds)
 {
     m_client->onVSyncParametersChanged(monotonicTimebase, intervalInSeconds);
 }
 
 void CCLayerTreeHostImpl::drawLayers(const FrameData& frame)
 {
     TRACE_EVENT0("cc", "CCLayerTreeHostImpl::drawLayers");
     ASSERT(canDraw());
-    ASSERT(frame.renderPasses.size());
+    ASSERT(!frame.renderPasses.empty());
 
     // FIXME: use the frame begin time from the overall compositor scheduler.
     // This value is currently inaccessible because it is up in Chromium's
     // RenderWidget.
     m_fpsCounter->markBeginningOfFrame(currentTime());
 
     if (m_settings.showDebugRects())
         m_debugRectHistory->saveDebugRectsForCurrentFrame(m_rootLayerImpl.get(), *frame.renderSurfaceLayerList, frame.occludingScreenSpaceRects, settings());
 
     // Because the contents of the HUD depend on everything else in the frame, the contents
@@ skipping 752 matching lines @@
 
     CCScrollbarAnimationController* scrollbarController = layer->scrollbarAnimationController();
     if (scrollbarController && scrollbarController->animate(monotonicTime))
         m_client->setNeedsRedrawOnImplThread();
 
     for (size_t i = 0; i < layer->children().size(); ++i)
         animateScrollbarsRecursive(layer->children()[i], monotonicTime);
 }
 
 } // namespace cc