Broadcast NotifyTimezoneChange to all RenderProcessHosts when the system time zone changes

content/renderer/renderer.sb

Index: content/renderer/renderer.sb
diff --git a/content/renderer/renderer.sb b/content/renderer/renderer.sb
index d68213532c2d5341b0fa87017cd915e6fd04d3da..184f5936571c578ec929ba623170b80c62a6b5c9 100644
--- a/content/renderer/renderer.sb
+++ b/content/renderer/renderer.sb
@@ -29,3 +29,12 @@
   (literal "/")
   (literal "/var")
 )
+
+; http://crbug.com/288697
+(allow file-read*
+  (regex #"^/(private/)?etc/localtime$")
+  (regex #"^/usr/share/zoneinfo/")
+)
+(allow file-read-metadata
+  (regex #"^/(private/)?etc$")
+)