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

chrome/browser/themes/browser_theme_pack_unittest.cc

Index: chrome/browser/themes/browser_theme_pack_unittest.cc
diff --git a/chrome/browser/themes/browser_theme_pack_unittest.cc b/chrome/browser/themes/browser_theme_pack_unittest.cc
index 0021214850a316898a87b10794a7dc0ab8bb2a8c..97bf82d07dc36a01fe40c18ead08d755f0f7f0a2 100644
--- a/chrome/browser/themes/browser_theme_pack_unittest.cc
+++ b/chrome/browser/themes/browser_theme_pack_unittest.cc
@@ -409,7 +409,7 @@ TEST_F(BrowserThemePackTest, CanBuildAndReadPack) {
     EXPECT_EQ("", error);
     ASSERT_TRUE(valid_value.get());
     scoped_refptr<Extension> extension(Extension::Create(
-        star_gazing_path, Extension::INVALID, *valid_value,
+        star_gazing_path, extensions::Manifest::INVALID_LOCATION, *valid_value,
         Extension::REQUIRE_KEY, &error));
     ASSERT_TRUE(extension.get());
     ASSERT_EQ("", error);