Make --wait-for-debugger work for mandoline launcher process.

mojo/runner/child_process.cc

Index: mojo/runner/child_process.cc
diff --git a/mojo/runner/child_process.cc b/mojo/runner/child_process.cc
index 35531931af47a7ac832b8f214b83451b16851cf3..d16c2d7cd9ed157e34fd6ca4bf9093cd96d10c28 100644
--- a/mojo/runner/child_process.cc
+++ b/mojo/runner/child_process.cc
@@ -8,7 +8,6 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
-#include "base/debug/debugger.h"
 #include "base/files/file_path.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ -281,19 +280,6 @@ int ChildProcessMain() {
   DVLOG(2) << "ChildProcessMain()";
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
-  if (command_line.HasSwitch(switches::kWaitForDebugger)) {
-    std::string app = command_line.GetSwitchValueASCII(switches::kApp);
-#if defined(OS_WIN)
-    MessageBox(NULL, command_line.GetSwitchValueNative(switches::kApp).c_str(),
-               command_line.GetSwitchValueNative(switches::kApp).c_str(),
-               MB_OK | MB_SETFOREGROUND);
-#else
-    LOG(ERROR) << command_line.GetSwitchValueASCII(switches::kApp)
-               << " waiting for GDB. pid: " << getpid();
-    base::debug::WaitForDebugger(60, true);
-#endif
-  }
-
   embedder::ScopedPlatformHandle platform_channel =
       embedder::PlatformChannelPair::PassClientHandleFromParentProcess(
           command_line);