Issue #6314: Support fetching non base64 encoded data URIs

[csadilek]

Simple change to support data URI that are not base64 encoded. With this backup/restore is now finally working in uBlock.

[codecov]

Codecov Report

Merging #6561 into master will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #6561      +/-   ##
============================================
- Coverage     77.68%   77.58%   -0.10%     
+ Complexity     4710     4635      -75     
============================================
  Files           626      618       -8     
  Lines         22925    22588     -337     
  Branches       3372     3327      -45     
============================================
- Hits          17809    17525     -284     
+ Misses         3740     3712      -28     
+ Partials       1376     1351      -25     

Impacted Files	Coverage Δ	Complexity Δ
...in/java/mozilla/components/concept/fetch/Client.kt	22.58% <0.00%> (-4.35%)	2.00 <0.00> (ø)
...a/components/support/migration/TelemetryHelpers.kt	88.17% <0.00%> (-0.96%)	0.00% <0.00%> (ø%)
...ents/support/migration/MigrationIntentProcessor.kt	100.00% <0.00%> (ø)	3.00% <0.00%> (ø%)
...onents/support/sync/telemetry/BaseGleanSyncPing.kt	100.00% <0.00%> (ø)	11.00% <0.00%> (ø%)
...components/feature/toolbar/internal/URLRenderer.kt
...lla/components/feature/toolbar/ToolbarPresenter.kt
.../mozilla/components/lib/nearby/NearbyConnection.kt
...la/components/feature/toolbar/ToolbarInteractor.kt
...nents/feature/toolbar/WebExtensionToolbarAction.kt
...ents/feature/toolbar/WebExtensionToolbarFeature.kt
... and 3 more

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[Amejia481]

👍

[csadilek]

bors r=Amejia481

[bors]

Build succeeded

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