Revert "Maintain change log file directly on trunk branch in push-to-trunk." and related changes.

tools/push-to-trunk/git_recipes.py

Index: tools/push-to-trunk/git_recipes.py
diff --git a/tools/push-to-trunk/git_recipes.py b/tools/push-to-trunk/git_recipes.py
index e8e81fc98cbf1732a97c468734a5c60b74e3d94b..fb7424f709478885ed5142d2dbb4c467f92b8222 100644
--- a/tools/push-to-trunk/git_recipes.py
+++ b/tools/push-to-trunk/git_recipes.py
@@ -133,11 +133,8 @@ class GitRecipesMixin(object):
   def GitDCommit(self):
     self.Git("cl dcommit -f --bypass-hooks", retry_on=lambda x: x is None)
 
-  def GitDiff(self, loc1, loc2, exclude=None):
-    exclude = exclude or []
-    files = self.Git(MakeArgs(["diff", "--name-only", loc1, loc2]))
-    files = filter(lambda f: f not in exclude, files.strip().splitlines())
-    return self.Git(MakeArgs(["diff", loc1, loc2] + files))
+  def GitDiff(self, loc1, loc2):
+    return self.Git(MakeArgs(["diff", loc1, loc2]))
 
   def GitPull(self):
     self.Git("pull")