Revert of Cross-repo recipe package system.

scripts/slave/recipe_modules/example/api.py

+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from recipe_engine import recipe_api
+
+class ExampleApi(recipe_api.RecipeApi):
+  """ExampleApi provides support for the example/* recipes."""
+
+  def __call__(self, name):
+    return self.m.step(name, ['true'])
+
+  @recipe_api.non_step
+  def explicit_non_composite_step(self):
+    # normally this would count as a composite step, since it runs substeps.
+    # However we want these steps to actually run in the parent context
+    # (for some reason), so we mark the function as not a step.
+    self("bogus")
+    self("steps")