Call pp::Size::IsEmpty() instead of !pp::Size::GetArea().

pdf/out_of_process_instance.cc

 // Copyright (c) 2012 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 "pdf/out_of_process_instance.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>  // for min/max()
@@ skipping 1427 matching lines @@
   }
   int bottom_of_document =
       GetDocumentPixelHeight() + (top_toolbar_height_ * device_scale_);
   if (bottom_of_document < available_area_.height())
     available_area_.set_height(bottom_of_document);
 
   CalculateBackgroundParts();
   engine_->PageOffsetUpdated(available_area_.point());
   engine_->PluginSizeUpdated(available_area_.size());
 
-  if (!document_size_.GetArea())
+  if (document_size_.IsEmpty())
     return;
   paint_manager_.InvalidateRect(pp::Rect(pp::Point(), plugin_size_));
 }
 
 void OutOfProcessInstance::LoadUrl(const std::string& url) {
   LoadUrlInternal(url, &embed_loader_, &OutOfProcessInstance::DidOpen);
 }
 
 void OutOfProcessInstance::LoadPreviewUrl(const std::string& url) {
   LoadUrlInternal(url, &embed_preview_loader_,
@@ skipping 98 matching lines @@
     const pp::FloatPoint& scroll_offset) {
   float max_x = document_size_.width() * zoom_ - plugin_dip_size_.width();
   float x = std::max(std::min(scroll_offset.x(), max_x), 0.0f);
   float min_y = -top_toolbar_height_;
   float max_y = document_size_.height() * zoom_ - plugin_dip_size_.height();
   float y = std::max(std::min(scroll_offset.y(), max_y), min_y);
   return pp::FloatPoint(x, y);
 }
 
 }  // namespace chrome_pdf