Expose the sandbox related code through the content API. I did a bit of cleanup while I was doing...

content/test/browser_test_base.cc

Index: content/test/browser_test_base.cc
===================================================================
--- content/test/browser_test_base.cc	(revision 107845)
+++ content/test/browser_test_base.cc	(working copy)
@@ -27,10 +27,7 @@
 }
 
 void BrowserTestBase::SetUp() {
-  SandboxInitWrapper sandbox_wrapper;
-  MainFunctionParams params(*CommandLine::ForCurrentProcess(),
-                            sandbox_wrapper,
-                            NULL);
+  MainFunctionParams params(*CommandLine::ForCurrentProcess());
   params.ui_task =
       NewRunnableMethod(this, &BrowserTestBase::ProxyRunTestOnMainThreadLoop);