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

chrome/browser/extensions/requirements_checker_browsertest.cc

Index: chrome/browser/extensions/requirements_checker_browsertest.cc
diff --git a/chrome/browser/extensions/requirements_checker_browsertest.cc b/chrome/browser/extensions/requirements_checker_browsertest.cc
index 7c2f0e653b64f6255bd7f454c007ee0c2934e73a..4d79d65a72a5a2c38852192cef628c925ff3cb95 100644
--- a/chrome/browser/extensions/requirements_checker_browsertest.cc
+++ b/chrome/browser/extensions/requirements_checker_browsertest.cc
@@ -47,7 +47,7 @@ class RequirementsCheckerBrowserTest : public ExtensionBrowserTest {
     extension_path = extension_path.AppendASCII("requirements_checker")
                                    .AppendASCII(extension_dir_name);
     scoped_refptr<const Extension> extension =
-        extension_file_util::LoadExtension(extension_path, Extension::LOAD,
+        extension_file_util::LoadExtension(extension_path, Manifest::LOAD,
                                            0, &load_error);
     CHECK(load_error.length() == 0u);
     return extension;