Bug 1210687 - Remove PushbackIter now it's not used anymore. r=gps

python/mozbuild/mozbuild/util.py

@@ -724,40 +724,6 @@ def lock_file(lockfile, max_wait = 600):
     return LockFile(lockfile)
 
 
-class PushbackIter(object):
-    '''Utility iterator that can deal with pushed back elements.
-
-    This behaves like a regular iterable, just that you can call
-    iter.pushback(item) to get the given item as next item in the
-    iteration.
-    '''
-    def __init__(self, iterable):
-        self.it = iter(iterable)
-        self.pushed_back = []
-
-    def __iter__(self):
-        return self
-
-    def __nonzero__(self):
-        if self.pushed_back:
-            return True
-
-        try:
-            self.pushed_back.insert(0, self.it.next())
-        except StopIteration:
-            return False
-        else:
-            return True
-
-    def next(self):
-        if self.pushed_back:
-            return self.pushed_back.pop()
-        return self.it.next()
-
-    def pushback(self, item):
-        self.pushed_back.append(item)
-
-
 def shell_quote(s):
     '''Given a string, returns a version enclosed with single quotes for use
     in a shell command line.