Use forked repohooks in manifest

BUG=b/149121748
TEST=init and sync

Change-Id: I3032701d8ebb30ec63f1dcda623a91339d21ce2e
diff --git a/external_full.xml b/external_full.xml
index e02951b..7d874d0 100644
--- a/external_full.xml
+++ b/external_full.xml
@@ -76,15 +76,14 @@
   <project path="src/platform2"
            name="mirrors/cros/chromiumos/platform2"
            revision="34c111af2f5931a49fd79757621c9b0a5b748ec0" />
-  <project path="src/repohooks"
-           name="mirrors/cros/chromiumos/repohooks"
-           revision="4cee050efc3512485b3f5ac6460388052fc266b6" />
 
   <!-- COS sources -->
   <project path="src/overlays"
            name="cos/overlays/board-overlays" />
   <project path="src/third_party/portage-stable"
            name="third_party/overlays/portage-stable" />
+  <project path="src/repohooks"
+           name="cos/repohooks" />
   <project path="manifest" name="cos/manifest" >
       <copyfile src="LICENSE" dest="LICENSE" />
   </project>
@@ -96,6 +95,6 @@
            revision="refs/heads/cos-5.4" />
 
   <repo-hooks enabled-list="pre-upload"
-           in-project="mirrors/cros/chromiumos/repohooks" />
+           in-project="cos/repohooks" />
 
 </manifest>