Revert of Change extension icon load errors to warnings

chrome/common/extensions/manifest_tests/extension_manifests_icons_unittest.cc

Index: chrome/common/extensions/manifest_tests/extension_manifests_icons_unittest.cc
diff --git a/chrome/common/extensions/manifest_tests/extension_manifests_icons_unittest.cc b/chrome/common/extensions/manifest_tests/extension_manifests_icons_unittest.cc
index 0a7a41fea557ae8485bd778a64551b6e1ecc35c7..e73ba823478fb0c6401177737b569f1e4a470696 100644
--- a/chrome/common/extensions/manifest_tests/extension_manifests_icons_unittest.cc
+++ b/chrome/common/extensions/manifest_tests/extension_manifests_icons_unittest.cc
@@ -15,22 +15,9 @@ namespace extensions {
 class IconsManifestTest : public ChromeManifestTest {
 };
 
-// Icons that don't exist on disk should be ignored (for most manifest
-// locations).
-TEST_F(IconsManifestTest, IgnoreNonExistentIcons) {
-  scoped_refptr<extensions::Extension> extension(
-      LoadAndExpectSuccess("normalize_icon_paths.json", Manifest::INTERNAL));
-  const ExtensionIconSet& icons = IconsInfo::GetIcons(extension.get());
-
-  EXPECT_EQ("", icons.Get(extension_misc::EXTENSION_ICON_BITTY,
-                          ExtensionIconSet::MATCH_EXACTLY));
-  EXPECT_EQ("", icons.Get(extension_misc::EXTENSION_ICON_MEDIUM,
-                          ExtensionIconSet::MATCH_EXACTLY));
-}
-
 TEST_F(IconsManifestTest, NormalizeIconPaths) {
   scoped_refptr<extensions::Extension> extension(
-      LoadAndExpectSuccess("normalize_icon_paths.json", Manifest::UNPACKED));
+      LoadAndExpectSuccess("normalize_icon_paths.json"));
   const ExtensionIconSet& icons = IconsInfo::GetIcons(extension.get());
 
   EXPECT_EQ("16.png", icons.Get(extension_misc::EXTENSION_ICON_BITTY,
@@ -41,7 +28,7 @@ TEST_F(IconsManifestTest, NormalizeIconPaths) {
 
 TEST_F(IconsManifestTest, IconSizes) {
   scoped_refptr<extensions::Extension> extension(
-      LoadAndExpectSuccess("init_icon_size.json", Manifest::UNPACKED));
+      LoadAndExpectSuccess("init_icon_size.json"));
   const ExtensionIconSet& icons = IconsInfo::GetIcons(extension.get());
 
   EXPECT_EQ("16.png", icons.Get(extension_misc::EXTENSION_ICON_BITTY,