Multiprocess test client: Android child process launcher rework.

base/process/process_win.cc

Index: base/process/process_win.cc
diff --git a/base/process/process_win.cc b/base/process/process_win.cc
index 6629f4565a74fb5e019ad05e845feba09f65625e..afc6a786ba439dd96b7fd1a621902b7e26a10e28 100644
--- a/base/process/process_win.cc
+++ b/base/process/process_win.cc
@@ -137,12 +137,12 @@ bool Process::Terminate(int exit_code, bool wait) const {
   return result;
 }
 
-bool Process::WaitForExit(int* exit_code) {
+bool Process::WaitForExit(int* exit_code) const {
   return WaitForExitWithTimeout(TimeDelta::FromMilliseconds(INFINITE),
                                 exit_code);
 }
 
-bool Process::WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) {
+bool Process::WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) const {
   // Record the event that this thread is blocking upon (for hang diagnosis).
   base::debug::ScopedProcessWaitActivity process_activity(this);