Move Extension Location and Type enums to Manifest, and move InstallWarning to its own file.

chrome/common/extensions/manifest_handler.h

Index: chrome/common/extensions/manifest_handler.h
diff --git a/chrome/common/extensions/manifest_handler.h b/chrome/common/extensions/manifest_handler.h
index ecd5c9d3419ecdb260773cd383e7011f513ed871..22c1a17f7470cd51fd8fceb5c5e99282fe4b436e 100644
--- a/chrome/common/extensions/manifest_handler.h
+++ b/chrome/common/extensions/manifest_handler.h
@@ -10,11 +10,10 @@
 
 #include "base/string16.h"
 #include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/manifest.h"
 
 namespace extensions {
 
-class Manifest;
-
 class ManifestHandler {
  public:
   ManifestHandler();
@@ -31,7 +30,7 @@ class ManifestHandler {
   // are present. This allows specifying a default parsed value for
   // extensions that don't declare our key in the manifest.
   // TODO(yoz): Use Feature availability instead.
-  virtual bool AlwaysParseForType(Extension::Type type);
+  virtual bool AlwaysParseForType(Manifest::Type type);
 
   // Associate |handler| with |key| in the manifest. A handler can register
   // for multiple keys. The global registry takes ownership of |handler|;