Revert of [autoroller] All commits in updates(), only roll interesting ones.

recipe_engine/autoroll_impl/commit_list.py

Index: recipe_engine/autoroll_impl/commit_list.py
diff --git a/recipe_engine/autoroll_impl/commit_list.py b/recipe_engine/autoroll_impl/commit_list.py
index f5eff8fa3a9f913a5463fd6299540ca8dbe0d370..189159ddd6cb8a5ce6d710429af04131e58fc1f0 100644
--- a/recipe_engine/autoroll_impl/commit_list.py
+++ b/recipe_engine/autoroll_impl/commit_list.py
@@ -24,7 +24,6 @@
     assert all(isinstance(c, CommitMetadata) for c in commit_list)
     self._commits = list(commit_list)
     self._cur_idx = 0
-    self._next_roll_candidate_idx = None
 
     # This maps from commit hash -> index in _commits.
     self._rev_idx = {}
@@ -69,28 +68,6 @@
     if nxt_idx >= len(self._commits):
       return None
     return self._commits[nxt_idx]
-
-  @property
-  def next_roll_candidate(self):
-    """Gets the next CommitMetadata and distance with roll_candidate==True
-    without advancing the current index.
-
-    Returns (CommitMetadata, <distance>), or (None, None) if there is no next
-      roll_candidate.
-    """
-    # Compute and cache the next roll candidate index.
-    nxt_idx = self._next_roll_candidate_idx
-    if nxt_idx is None or nxt_idx <= self._cur_idx:
-      nxt_idx = None
-      for i, commit in enumerate(self._commits[self._cur_idx+1:]):
-        if commit.roll_candidate:
-          nxt_idx = self._cur_idx + i + 1
-          break
-      self._next_roll_candidate_idx = nxt_idx
-
-    if nxt_idx is not None:
-      return self._commits[nxt_idx], nxt_idx - self._cur_idx
-    return (None, None)
 
   def advance(self):
     """Advances the current CommitMetadata by one.