content: Rename num raster threads -> num worker threads.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index e5b02417221d52006be60e31bc30d0c2f07fd788..13406beaa4b19e1142fb21597d838b892898c6b5 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -786,19 +786,19 @@ void RenderThreadImpl::Init(
       base::Bind(&RenderThreadImpl::OnSyncMemoryPressure,
                  base::Unretained(this))));
 
-  int num_raster_threads = 0;
+  int num_worker_threads = 0;
   std::string string_value =
-      command_line.GetSwitchValueASCII(switches::kNumRasterThreads);
-  bool parsed_num_raster_threads =
-      base::StringToInt(string_value, &num_raster_threads);
-  DCHECK(parsed_num_raster_threads) << string_value;
-  DCHECK_GT(num_raster_threads, 0);
+      command_line.GetSwitchValueASCII(switches::kNumWorkerThreads);
+  bool parsed_num_worker_threads =
+      base::StringToInt(string_value, &num_worker_threads);
+  DCHECK(parsed_num_worker_threads) << string_value;
+  DCHECK_GT(num_worker_threads, 0);
 
   // TODO(vmpstr): If the flag sticks, we should clean it up and always have
   // image decode tasks.
   are_image_decode_tasks_enabled_ = true;
 
-  categorized_worker_pool_->Start(num_raster_threads);
+  categorized_worker_pool_->Start(num_worker_threads);
 
   // TODO(boliu): In single process, browser main loop should set up the
   // discardable memory manager, and should skip this if kSingleProcess.