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Feedback_private currently has a extension native handler for getting a Blob's UUID. Media Galleries API Metadata and other extensions that take a Blob will also want this.

This simply moves the function from a Feedback_private specific custom binding to a general ObjectBackedNativeHandler called BlobNativeHandler. This follows the CssNativeHandler example.

The parent class changed from ChromeV8Extension to ObjectBackedNativeHandler because ChromeV8Extension class has been deprecated.

R=thestig@chromium.org

BUG=318450

Review URL: https://codereview.chromium.org/76703002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236847 0039d316-1c4b-4281-b951-d872f2087c98