Revert of Change extension icon load errors to warnings

extensions/common/file_util.cc

Index: extensions/common/file_util.cc
diff --git a/extensions/common/file_util.cc b/extensions/common/file_util.cc
index 3ddf6d0e402c7830ddd368a350012fc7b71accac..ae12f2ca6d527fb2940499d9e08bfb24b130a1a9 100644
--- a/extensions/common/file_util.cc
+++ b/extensions/common/file_util.cc
@@ -56,6 +56,12 @@ enum SafeInstallationFlag {
 };
 SafeInstallationFlag g_use_safe_installation = DEFAULT;
 
+// Returns true if the given file path exists and is not zero-length.
+bool ValidateFilePath(const base::FilePath& path) {
+  int64_t size = 0;
+  return base::PathExists(path) && base::GetFileSize(path, &size) && size != 0;
+}
+
 // Returns true if the extension installation should flush all files and the
 // directory.
 bool UseSafeInstallation() {
@@ -263,11 +269,6 @@ scoped_ptr<base::DictionaryValue> LoadManifest(
   return base::DictionaryValue::From(std::move(root));
 }
 
-bool ValidateFilePath(const base::FilePath& path) {
-  int64_t size = 0;
-  return base::PathExists(path) && base::GetFileSize(path, &size) && size != 0;
-}
-
 bool ValidateExtension(const Extension* extension,
                        std::string* error,
                        std::vector<InstallWarning>* warnings) {