Refactor the python system_impl module.

mojo/public/python/mojo/c_environment_common.pxd

Index: mojo/public/python/mojo/c_environment_common.pxd
diff --git a/mojo/public/python/mojo/c_environment.pxd b/mojo/public/python/mojo/c_environment_common.pxd
similarity index 61%
copy from mojo/public/python/mojo/c_environment.pxd
copy to mojo/public/python/mojo/c_environment_common.pxd
index 3dfa79960ed5c17786b91e364f572f7099d0ab0c..e8996bafac26d82bed2549d100f673b207d76494 100644
--- a/mojo/public/python/mojo/c_environment.pxd
+++ b/mojo/public/python/mojo/c_environment_common.pxd
@@ -4,7 +4,7 @@
 
 # distutils: language = c++
 
-from libc.stdint cimport int64_t, intptr_t, uint32_t, uint64_t
+from libc.stdint cimport intptr_t, uint32_t, uint64_t
 
 
 cdef extern from "mojo/public/c/system/core.h" nogil:
@@ -13,18 +13,12 @@ cdef extern from "mojo/public/c/system/core.h" nogil:
   ctypedef uint32_t MojoHandleSignals
 
 
-cdef extern from "mojo/public/cpp/bindings/callback.h" nogil:
-  cdef cppclass CClosure "mojo::Callback<void()>":
-    CClosure()
-
-
 cdef extern from "mojo/public/c/environment/async_waiter.h"  nogil:
   ctypedef intptr_t MojoAsyncWaitID
 
 
-cdef extern from "mojo/public/python/src/python_system_helper.h" \
+cdef extern from "mojo/public/python/src/common.h" \
     namespace "mojo::python" nogil:
-  cdef CClosure BuildClosure(object)
   cdef cppclass PythonAsyncWaiter "mojo::python::PythonAsyncWaiter":
     PythonAsyncWaiter()
     MojoAsyncWaitID AsyncWait(MojoHandle,
@@ -34,16 +28,6 @@ cdef extern from "mojo/public/python/src/python_system_helper.h" \
     void CancelWait(MojoAsyncWaitID)
 
 
-cdef extern from "mojo/public/cpp/utility/run_loop.h" nogil:
-  cdef cppclass CRunLoop "mojo::RunLoop":
-    CRunLoop()
-    void Run() except *
-    void RunUntilIdle() except *
-    void Quit()
-    void PostDelayedTask(CClosure&, int64_t)
-  cdef CRunLoop CRunLoopCurrent "mojo::RunLoop::current"()
-
-
 cdef extern from "mojo/public/cpp/environment/environment.h" nogil:
   cdef cppclass CEnvironment "mojo::Environment":
     CEnvironment()