Drop Python 3.3 support from several stubs (#2266)

* Drop Python 3.3 support from importlib stubs

* Drop Python 3.3 support from html and symbol stubs

stdlib/3/multiprocessing/__init__.pyi

@@ -76,10 +76,8 @@ def get_logger() -> Logger: ...
 def log_to_stderr(level: Optional[Union[str, int]] = ...) -> Logger: ...
 def Manager() -> SyncManager: ...
 def set_forkserver_preload(module_names: List[str]) -> None: ...
-if sys.platform == 'win32' or sys.version_info >= (3, 4):
-    def set_executable(executable: str) -> None: ...
-if sys.version_info >= (3, 4):
-    def get_all_start_methods() -> List[str]: ...
-    def get_context(method: Optional[str] = ...) -> BaseContext: ...
-    def get_start_method(allow_none: Optional[bool]) -> Optional[str]: ...
-    def set_start_method(method: str, force: Optional[bool] = ...) -> None: ...
+def set_executable(executable: str) -> None: ...
+def get_all_start_methods() -> List[str]: ...
+def get_context(method: Optional[str] = ...) -> BaseContext: ...
+def get_start_method(allow_none: Optional[bool]) -> Optional[str]: ...
+def set_start_method(method: str, force: Optional[bool] = ...) -> None: ...

stdlib/3/multiprocessing/connection.pyi

@@ -1,6 +1,5 @@
 from typing import Any, Iterable, List, Optional, Tuple, Type, Union
 import socket
-import sys
 import types
 
 # https://docs.python.org/3/library/multiprocessing.html#address-formats
@@ -8,8 +7,7 @@ _Address = Union[str, Tuple[str, int]]
 
 def deliver_challenge(connection: Connection, authkey: bytes) -> None: ...
 def answer_challenge(connection: Connection, authkey: bytes) -> None: ...
-if sys.version_info >= (3, 3):
-    def wait(object_list: Iterable[Union[Connection, socket.socket, int]], timeout: Optional[float] = ...) -> List[Union[Connection, socket.socket, int]]: ...
+def wait(object_list: Iterable[Union[Connection, socket.socket, int]], timeout: Optional[float] = ...) -> List[Union[Connection, socket.socket, int]]: ...
 def Client(address: _Address, family: Optional[str] = ..., authkey: Optional[bytes] = ...) -> Connection: ...
 def Pipe(duplex: bool = ...) -> Tuple[Connection, Connection]: ...
 
@@ -21,9 +19,8 @@ class Listener:
     def address(self) -> _Address: ...
     @property
     def last_accepted(self) -> Optional[_Address]: ...
-    if sys.version_info >= (3, 3):
-        def __enter__(self) -> Listener: ...
-        def __exit__(self, exc_type: Optional[Type[BaseException]], exc_value: Optional[BaseException], exc_tb: Optional[types.TracebackType]) -> None: ...
+    def __enter__(self) -> Listener: ...
+    def __exit__(self, exc_type: Optional[Type[BaseException]], exc_value: Optional[BaseException], exc_tb: Optional[types.TracebackType]) -> None: ...
 
 class Connection:
     def close(self) -> None: ...

stdlib/3/multiprocessing/synchronize.pyi

@@ -28,10 +28,9 @@ class Condition(ContextManager[bool]):
         def notify(self) -> None: ...
     def notify_all(self) -> None: ...
     def wait(self, timeout: Optional[float] = ...) -> bool: ...
-    if sys.version_info >= (3, 3):
-        def wait_for(self,
-                     predicate: Callable[[], bool],
-                     timeout: Optional[float] = ...) -> bool: ...
+    def wait_for(self,
+                 predicate: Callable[[], bool],
+                 timeout: Optional[float] = ...) -> bool: ...
     def acquire(self,
                 block: bool = ...,
                 timeout: Optional[float] = ...) -> bool: ...