Move CrxFile, FileReader, ExtensionResource to src/extensions.

extensions/common/extension_resource.h

Index: extensions/common/extension_resource.h
diff --git a/chrome/common/extensions/extension_resource.h b/extensions/common/extension_resource.h
similarity index 94%
rename from chrome/common/extensions/extension_resource.h
rename to extensions/common/extension_resource.h
index a8d632cfd494c8c0d8636eeb7c533185bf90f799..806889e8d31e2371d5ba1cea6dc6dd5bd1de76df 100644
--- a/chrome/common/extensions/extension_resource.h
+++ b/extensions/common/extension_resource.h
@@ -2,13 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
-#define CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
+#ifndef EXTENSIONS_COMMON_EXTENSION_RESOURCE_H_
+#define EXTENSIONS_COMMON_EXTENSION_RESOURCE_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
 
+namespace extensions {
+
 // Represents a resource inside an extension. For example, an image, or a
 // JavaScript file. This is more complicated than just a simple FilePath
 // because extension resources can come from multiple physical file locations
@@ -82,4 +84,6 @@ class ExtensionResource {
   mutable base::FilePath full_resource_path_;
 };
 
-#endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_EXTENSION_RESOURCE_H_