Revert "Bulk-reads and Request caching in Course Grade Report"

This reverts commit 16e9636513.

common/djangoapps/request_cache/__init__.py

@@ -41,16 +41,6 @@ def get_cache(name):
     return middleware.RequestCache.get_request_cache(name)
 
 
-def clear_cache(name):
-    """
-    Clears the request cache named ``name``.
-
-    Arguments:
-        name (str): The name of the request cache to clear
-    """
-    return middleware.RequestCache.clear_request_cache(name)
-
-
 def get_request():
     """
     Return the current request.