Make the popup blocker on by default. Flip the flag to be a disabling one.

chrome/browser/ui/views/location_bar/content_setting_image_view.cc

Index: chrome/browser/ui/views/location_bar/content_setting_image_view.cc
diff --git a/chrome/browser/ui/views/location_bar/content_setting_image_view.cc b/chrome/browser/ui/views/location_bar/content_setting_image_view.cc
index a1bf8eecb817789e92fe568f32c3820cfe42e3ac..c31f14302718f9b77846cf22fa3c2e0736d654ac 100644
--- a/chrome/browser/ui/views/location_bar/content_setting_image_view.cc
+++ b/chrome/browser/ui/views/location_bar/content_setting_image_view.cc
@@ -95,8 +95,8 @@ void ContentSettingImageView::UpdateFromTabContents(TabContents* tab_contents) {
       content_setting_image_model_->explanatory_string_id();
   // Check if the animation is enabled and if the string for animation is
   // available.
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableBlockContentAnimation) || !animated_string_id)
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kDisableBlockContentAnimation) || !animated_string_id)
     return;
 
   // Do not start animation if already in progress.