Move GetSiteForExtensionId to //extensions

R=benwells
TBR=derat,tzik # files using the moved function

Bug: 729713
Change-Id: I8981a0889a803ae3af03b7878135fd9d1ed217ad
Reviewed-on: https://chromium-review.googlesource.com/525058
Reviewed-by: Michael Giuffrida <[email protected]>
Reviewed-by: Ben Wells <[email protected]>
Commit-Queue: Michael Giuffrida <[email protected]>
Cr-Commit-Position: refs/heads/master@{#477573}
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index a77c73d..66bbac7 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -76,6 +76,7 @@
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
+#include "extensions/browser/extension_util.h"
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/browser/external_install_info.h"
 #include "extensions/browser/install_flag.h"