Revert "init: change --depth default to 1 for manifest repo"

This reverts commit 076d54652e.

Reason for revert: crbug.com/gerrit/16358

Change-Id: I2970eb50677cca69786f71edffe4aa5271cf139f
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/349834
Reviewed-by: Sam Saccone <samccone@google.com>
Tested-by: LaMont Jones <lamontjones@google.com>
Reviewed-by: Xin Li <delphij@google.com>

subcmds/init.py

@@ -109,10 +109,6 @@ to update the working directory files.
     Args:
       opt: options from optparse.
     """
-    # Normally this value is set when instantiating the project, but the
-    # manifest project is special and is created when instantiating the
-    # manifest which happens before we parse options.
-    self.manifest.manifestProject.clone_depth = opt.manifest_depth
     if not self.manifest.manifestProject.Sync(
         manifest_url=opt.manifest_url,
         manifest_branch=opt.manifest_branch,