[Extensions] Move TestExtensionDir to //extensions/test

Move TestExtensionDir from //chrome/browser/extensions to
//extensions/test.

Bug: 773004

TBRs for #include updates:
[email protected] (c/b/devtools)
[email protected] (c/b/metrics)
[email protected] (c/b/safe_browsing)
[email protected] (c/b/site_details_browsertest.cc)

Change-Id: I099df815d73dbb3fd563b4e09f0058e8cb9530de
Reviewed-on: https://chromium-review.googlesource.com/883945
Commit-Queue: Devlin <[email protected]>
Reviewed-by: Karan Bhatia <[email protected]>
Cr-Commit-Position: refs/heads/master@{#531775}
diff --git a/chrome/browser/extensions/extension_loading_browsertest.cc b/chrome/browser/extensions/extension_loading_browsertest.cc
index f855ff9..5acc2408 100644
--- a/chrome/browser/extensions/extension_loading_browsertest.cc
+++ b/chrome/browser/extensions/extension_loading_browsertest.cc
@@ -12,7 +12,6 @@
 #include "chrome/browser/extensions/devtools_util.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/test_extension_dir.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/in_process_browser_test.h"
@@ -23,6 +22,7 @@
 #include "extensions/browser/process_manager.h"
 #include "extensions/common/permissions/permissions_data.h"
 #include "extensions/test/extension_test_message_listener.h"
+#include "extensions/test/test_extension_dir.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "testing/gmock/include/gmock/gmock.h"