linux: Use gtk-cursor-blink from GtkSettings to set the caret blink interval

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index b50b0d15dc4c114065cc1cce1f69394e0b824c97..ed99e663af90f38dd3fea54d13ff1dca03c90ec9 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -1627,6 +1627,7 @@ struct ParamTraits<RendererPreferences> {
     WriteParam(m, p.inactive_selection_bg_color);
     WriteParam(m, p.inactive_selection_fg_color);
     WriteParam(m, p.browser_handles_top_level_requests);
+    WriteParam(m, p.caret_blink_interval);
   }
   static bool Read(const Message* m, void** iter, param_type* p) {
     if (!ReadParam(m, iter, &p->can_accept_load_drops))
@@ -1673,6 +1674,9 @@ struct ParamTraits<RendererPreferences> {
     if (!ReadParam(m, iter, &p->browser_handles_top_level_requests))
       return false;
 
+    if (!ReadParam(m, iter, &p->caret_blink_interval))
+      return false;
+
     return true;
   }
   static void Log(const param_type& p, std::wstring* l) {