Basic scaffolding for a "content shell", i.e. test browser over the content module.

chrome/app/chrome_main.cc

Index: chrome/app/chrome_main.cc
===================================================================
--- chrome/app/chrome_main.cc	(revision 100566)
+++ chrome/app/chrome_main.cc	(working copy)
@@ -121,7 +121,7 @@
 #elif defined(OS_POSIX)
 extern "C" {
 __attribute__((visibility("default")))
-int ChromeMain(int argc, char** argv);
+int ChromeMain(int argc, const char** argv);
 }
 #endif
 
@@ -759,7 +759,7 @@
   ChromeMainDelegate chrome_main_delegate;
   return content::ContentMain(instance, sandbox_info, &chrome_main_delegate);
 #elif defined(OS_POSIX)
-int ChromeMain(int argc, char** argv) {
+int ChromeMain(int argc, const char** argv) {
   ChromeMainDelegate chrome_main_delegate;
   return content::ContentMain(argc, argv, &chrome_main_delegate);
 #endif