Get rid of multiprocess_test's debug_on_start arguments.

chrome/common/multi_process_lock_unittest.cc

Index: chrome/common/multi_process_lock_unittest.cc
diff --git a/chrome/common/multi_process_lock_unittest.cc b/chrome/common/multi_process_lock_unittest.cc
index 95939de4f84898d79005e656ff4b0315edde3420..773b66e334bb0fdc11853d4dd3fa16289f75950a 100644
--- a/chrome/common/multi_process_lock_unittest.cc
+++ b/chrome/common/multi_process_lock_unittest.cc
@@ -51,7 +51,7 @@ std::string MultiProcessLockTest::GenerateLockName() {
 
 void MultiProcessLockTest::ExpectLockIsLocked(const std::string &name) {
   ScopedEnvironmentVariable var(kLockEnviromentVarName, name);
-  base::ProcessHandle handle = SpawnChild("MultiProcessLockTryFailMain", false);
+  base::ProcessHandle handle = SpawnChild("MultiProcessLockTryFailMain");
   ASSERT_TRUE(handle);
   int exit_code = 0;
   EXPECT_TRUE(base::WaitForExitCode(handle, &exit_code));
@@ -61,8 +61,7 @@ void MultiProcessLockTest::ExpectLockIsLocked(const std::string &name) {
 void MultiProcessLockTest::ExpectLockIsUnlocked(
     const std::string &name) {
   ScopedEnvironmentVariable var(kLockEnviromentVarName, name);
-  base::ProcessHandle handle = SpawnChild("MultiProcessLockTrySucceedMain",
-                                          false);
+  base::ProcessHandle handle = SpawnChild("MultiProcessLockTrySucceedMain");
   ASSERT_TRUE(handle);
   int exit_code = 0;
   EXPECT_TRUE(base::WaitForExitCode(handle, &exit_code));