Relanding "Multiprocess test client: Android child process launcher rework."

mojo/edk/test/run_all_unittests.cc

Index: mojo/edk/test/run_all_unittests.cc
diff --git a/mojo/edk/test/run_all_unittests.cc b/mojo/edk/test/run_all_unittests.cc
index cd6b241d605b05c6b8982303a3fa8e8a51ddaff3..0b0663b26f5f8825da5dc5959a79b55a31058e4f 100644
--- a/mojo/edk/test/run_all_unittests.cc
+++ b/mojo/edk/test/run_all_unittests.cc
@@ -26,10 +26,6 @@ int main(int argc, char** argv) {
   testing::GTEST_FLAG(death_test_style) = "threadsafe";
 #endif
 #if defined(OS_ANDROID)
-  // Enable the alternate test child implementation. This is needed because Mojo
-  // tests need to spawn test children after initialising the Mojo system.
-  base::InitAndroidMultiProcessTestHelper(main);
-
   // On android, the test framework has a signal handler that will print a
   // [ CRASH ] line when the application crashes. This breaks death test has the
   // test runner will consider the death of the child process a test failure.