Add base:: qualification to some CommandLine references in content.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index bc89f8e80f87d2e9eaec9ff9d99a3e31f23ae6b7..9be444373761950e79c04cdcbabb99daba1ee991 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -844,7 +844,8 @@ float RenderWidgetHostViewMac::ViewScaleFactor() const {
 
 void RenderWidgetHostViewMac::UpdateDisplayLink() {
   static bool is_vsync_disabled =
-      CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync);
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableGpuVsync);
   if (is_vsync_disabled)
     return;
 
@@ -2289,7 +2290,8 @@ SkColorType RenderWidgetHostViewMac::PreferredReadbackFormat() {
 bool RenderWidgetHostViewMac::AcceleratedLayerShouldAckImmediately() const {
   // If vsync is disabled, then always draw and ack frames immediately.
   static bool is_vsync_disabled =
-      CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync);
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableGpuVsync);
   if (is_vsync_disabled)
     return true;