Fix DartObservatory failure due to security policy settings.

content/browser/webui/url_data_manager_backend.cc

Index: content/browser/webui/url_data_manager_backend.cc
diff --git a/content/browser/webui/url_data_manager_backend.cc b/content/browser/webui/url_data_manager_backend.cc
index 1bcbdb76e9eaae056a461d785afb8dba9f71657a..69040d04bdfe246e3baa7396551439f77082f5b8 100644
--- a/content/browser/webui/url_data_manager_backend.cc
+++ b/content/browser/webui/url_data_manager_backend.cc
@@ -47,10 +47,12 @@ namespace content {
 
 namespace {
 
+// TODO(jacobr) remove https://www.google.com when the dependency on the
+// Google Charts API is removed from the Dart Observatory.
 // TODO(tsepez) remove unsafe-eval when bidichecker_packaged.js fixed.
 const char kChromeURLContentSecurityPolicyHeaderBase[] =
     "Content-Security-Policy: script-src chrome://resources "
-    "'self' 'unsafe-eval'; ";
+    "'self' https://www.google.com 'unsafe-eval'; ";
 
 const char kChromeURLXFrameOptionsHeader[] = "X-Frame-Options: DENY";