sel_main_chrome.c: Don't call NaClWaitForStartModuleCommand. Get load status directly.
sel_main_chrome.c: Don't call NaClWaitForStartModuleCommand. Get load status directly.

Chromium no longer gets the load status from the start_module
SRPC call. So, we can start removing start_module.

First remove the NaClWaitForStartModuleCommand on the NaCl
side. After this we can remove the "start_module" SRPC
invocation from the Chromium side. There is still a user of
NaClWaitForStartModuleCommand in sel_main.c for sel_universal,
so that remains.

Related CL to remove "start_module" from the Chromium side:
https://codereview.chromium.org/1111413002/

BUG= https://code.google.com/p/chromium/issues/detail?id=459250
R=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/1113893002

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