Run shim's watchForTag on document.DOMContentLoaded

chrome/chrome_renderer.gypi

Index: chrome/chrome_renderer.gypi
diff --git a/chrome/chrome_renderer.gypi b/chrome/chrome_renderer.gypi
index 070ea5fb86cd338c37c0d57e118a5cf0b57f251a..f656fc6eb76a8e0d13bea2faf4030d2bbf95b25f 100644
--- a/chrome/chrome_renderer.gypi
+++ b/chrome/chrome_renderer.gypi
@@ -113,6 +113,8 @@
         'renderer/extensions/page_capture_custom_bindings.h',
         'renderer/extensions/renderer_permissions_policy_delegate.cc',
         'renderer/extensions/renderer_permissions_policy_delegate.h',
+        'renderer/extensions/render_view_observer_natives.cc',
+        'renderer/extensions/render_view_observer_natives.h',
         'renderer/extensions/request_sender.cc',
         'renderer/extensions/request_sender.h',
         'renderer/extensions/resource_request_policy.cc',
@@ -156,8 +158,8 @@
         'renderer/net/net_error_helper.h',
         'renderer/net/predictor_queue.cc',
         'renderer/net/predictor_queue.h',
-	'renderer/net/prescient_networking_dispatcher.cc',
-	'renderer/net/prescient_networking_dispatcher.h',
+        'renderer/net/prescient_networking_dispatcher.cc',
+        'renderer/net/prescient_networking_dispatcher.h',
         'renderer/net/renderer_net_predictor.cc',
         'renderer/net/renderer_net_predictor.h',
         'renderer/net_benchmarking_extension.cc',