mac: use NSUserDefaults values for caret blink rate if present

chrome/browser/renderer_preferences_util.cc

Index: chrome/browser/renderer_preferences_util.cc
diff --git a/chrome/browser/renderer_preferences_util.cc b/chrome/browser/renderer_preferences_util.cc
index d47d2d0e51f05f37ea74868f914df6eef75c7289..ad5e3017221badabb2f640eebbfa41df4326b7db 100644
--- a/chrome/browser/renderer_preferences_util.cc
+++ b/chrome/browser/renderer_preferences_util.cc
@@ -26,6 +26,10 @@
 #include "ui/views/controls/textfield/textfield.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include "ui/base/cocoa/defaults_utils.h"
+#endif
+
 #if defined(USE_AURA) && defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/themes/theme_service_factory.h"
@@ -120,6 +124,12 @@ void UpdateFromSystemSettings(content::RendererPreferences* prefs,
   prefs->caret_blink_interval = views::Textfield::GetCaretBlinkMs() / 1000.0;
 #endif
 
+#if defined(OS_MACOSX)
+  base::TimeDelta interval;
+  if (ui::TextInsertionCaretBlinkPeriod(&interval))
+    prefs->caret_blink_interval = interval.InSecondsF();
+#endif
+
 #if defined(USE_AURA) && defined(OS_LINUX) && !defined(OS_CHROMEOS)
   views::LinuxUI* linux_ui = views::LinuxUI::instance();
   if (linux_ui) {