Move a bunch of child-only code from content/common to content/child

content/worker/worker_main.cc

Index: content/worker/worker_main.cc
diff --git a/content/worker/worker_main.cc b/content/worker/worker_main.cc
index 459e90731030ea26974004276639f3fe8dd37a63..4a48bfc7defc8f4f7a44c84e91fa4c6870a12053 100644
--- a/content/worker/worker_main.cc
+++ b/content/worker/worker_main.cc
@@ -9,7 +9,8 @@
 #include "base/power_monitor/power_monitor.h"
 #include "base/string_util.h"
 #include "base/threading/platform_thread.h"
-#include "content/common/child_process.h"
+#include "content/child/child_process.h"
+#include "content/common/debug_util.h"
 #include "content/common/sandbox_linux.h"
 #include "content/public/common/main_function_params.h"
 #include "content/public/common/sandbox_init.h"
@@ -62,7 +63,7 @@ int WorkerMain(const MainFunctionParams& parameters) {
 
   const CommandLine& parsed_command_line = parameters.command_line;
   if (parsed_command_line.HasSwitch(switches::kWaitForDebugger)) {
-    ChildProcess::WaitForDebugger("Worker");
+    WaitForDebugger("Worker");
   }
 
   // Load the accelerator table from the browser executable and tell the