Gets component build to work with aura. As part of this I needed to

ui/aura_shell/shell.h

Index: ui/aura_shell/shell.h
diff --git a/ui/aura_shell/shell.h b/ui/aura_shell/shell.h
index 1b67eaab86ff8fe01c9634a77f30983b3f83d098..1e70ce009eef79d241a25cf76ef8fa93f3b18393 100644
--- a/ui/aura_shell/shell.h
+++ b/ui/aura_shell/shell.h
@@ -9,6 +9,7 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/desktop_delegate.h"
+#include "ui/aura_shell/aura_shell_export.h"
 
 namespace aura {
 class Window;
@@ -18,7 +19,7 @@ namespace aura_shell {
 
 // Shell is a singleton object that presents the Shell API and implements the
 // Desktop's delegate interface.
-class Shell : public aura::DesktopDelegate {
+class AURA_SHELL_EXPORT Shell : public aura::DesktopDelegate {
  public:
   // Upon creation, the Shell sets itself as the Desktop's delegate, which takes
   // ownership of the Shell.