Move ManifestHandler to top-level extensions.

extensions/DEPS

Index: extensions/DEPS
diff --git a/extensions/DEPS b/extensions/DEPS
index 14eae2fd907cfd3002ed0e93b078404cc0527b60..29ebf1eb0db5f0d95e42eee94879f84f654f6601 100644
--- a/extensions/DEPS
+++ b/extensions/DEPS
@@ -7,11 +7,15 @@ include_rules = [
 
 # More specific rules for what we are allowed to include.
 specific_include_rules = {
-  ".*test\.cc": [
+  ".*test\.cc$": [
     "+content/public/test",
   ],
-  "api_permission_set_unittest\.cc": [
-    # Temporary include for tests.
+  # Temporary includes for tests.
+  "^api_permission_set_unittest\.cc$": [
     "+chrome/common/extensions/extension_messages.h",
   ],
+  "^manifest_handler_unittest\.cc$": [
+    "+chrome/common/extensions/extension_builder.h",
+    "+chrome/common/extensions/value_builder.h",
+  ],
 }