Move extensions manifest IconsHandler to //extensions

extensions/common/file_util.h

Index: extensions/common/file_util.h
diff --git a/extensions/common/file_util.h b/extensions/common/file_util.h
index 3ec7adec5b7ae186889e762e386e3b6658f41bf8..5a605ec5b27f2e5eca18aafc250eb79d60297866 100644
--- a/extensions/common/file_util.h
+++ b/extensions/common/file_util.h
@@ -5,6 +5,9 @@
 #ifndef EXTENSIONS_COMMON_FILE_UTIL_H_
 #define EXTENSIONS_COMMON_FILE_UTIL_H_
 
+#include <string>
+
+class ExtensionIconSet;
 class GURL;
 
 namespace base {
@@ -12,6 +15,8 @@ class FilePath;
 }
 
 namespace extensions {
+class Extension;
+
 namespace file_util {
 
 // Get a relative file path from a chrome-extension:// URL.
@@ -22,6 +27,13 @@ base::FilePath ExtensionURLToRelativeFilePath(const GURL& url);
 base::FilePath ExtensionResourceURLToFilePath(const GURL& url,
                                               const base::FilePath& root);
 
+// Returns true if the icons in the icon set exist. Oherwise, populates
+// |error| with the |error_message_id| for an invalid file.
+bool ValidateExtensionIconSet(const ExtensionIconSet& icon_set,
+                              const Extension* extension,
+                              int error_message_id,
+                              std::string* error);
+
 }  // namespace file_util
 }  // namespace extensions