Revert "Bug 970138 - [Tooling] Add a commit hook to unify the file permision"

This reverts commit 26cec18074b99c169d1bdf76c8a4a80b0acc4c83.
Merge pull request #17094 from gaye/revert-26cec18074b99c169d1bdf76c8a4a80b0acc4c83

Revert "Bug 970138 - [Tooling] Add a commit hook to unify the file permission
Bug 968483 - [Building Blocks] Update header design to accommodate larger back-button