Move apps/shell to extensions/shell.

extensions/shell/app/shell_main.cc

Index: extensions/shell/app/shell_main.cc
diff --git a/apps/shell/app/shell_main.cc b/extensions/shell/app/shell_main.cc
similarity index 89%
rename from apps/shell/app/shell_main.cc
rename to extensions/shell/app/shell_main.cc
index cd44b99d7c9d504fb4263040e1d802753df97be2..25f7a8974d6e1e121746bfb4c56ba4564ed0b269 100644
--- a/apps/shell/app/shell_main.cc
+++ b/extensions/shell/app/shell_main.cc
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "apps/shell/app/shell_main_delegate.h"
 #include "content/public/app/content_main.h"
+#include "extensions/shell/app/shell_main_delegate.h"
 
 #if defined(OS_WIN)
 #include "content/public/app/startup_helper_win.h"
@@ -15,7 +15,7 @@ int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t*, int) {
 #else
 int main(int argc, const char** argv) {
 #endif
-  apps::ShellMainDelegate delegate;
+  extensions::ShellMainDelegate delegate;
   content::ContentMainParams params(&delegate);
 
 #if defined(OS_WIN)