Run ContentMain in a browser_test's browser process. This removes duplication of code in the browse…

content/public/test/test_launcher.h

Index: content/public/test/test_launcher.h
===================================================================
--- content/public/test/test_launcher.h	(revision 257128)
+++ content/public/test/test_launcher.h	(working copy)
@@ -19,6 +19,7 @@
 
 namespace content {
 class ContentMainDelegate;
+struct ContentMainParams;
 
 extern const char kEmptyTestName[];
 extern const char kHelpFlag[];
@@ -56,6 +57,7 @@
                 char** argv) WARN_UNUSED_RESULT;
 
 TestLauncherDelegate* GetCurrentTestLauncherDelegate();
+ContentMainParams* GetContentMainParams();
 
 }  // namespace content