HTMLCanvasElement.toDataURL(), HTMLCanvasElement.toBlob() do not work on brave mobile with fingerprint protection

Description of the issue:
HTMLCanvasElement.toDataURL(), HTMLCanvasElement.toBlob() return an error when fingerprinting protection is enabled.

Steps to Reproduce (add as many as necessary):
Launch Brave Mobile and enable fingerprinting protection
2. Visit, then press the button
3. Now the canvas data should appear under the button.

Actual Result (gifs and screenshots are welcome!):

Expected Result:

Reproduces how often:

Brave Version(See the About Brave page in the main menu):
Brave 1.0.99, Chromium 75.0.3770.101

Reproducible on current live release (yes/no):

Additional information:

Simon here from We are very big Brave fans :slight_smile: Unfortunately we have a problem with the canvas features, but we need them for cropping images. It only seems to be a problem with Brave Mobile when fingerprinting protection is enabled.

Enclosed once again the demo for testing:

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