Remove extensions-common-manifest_url_handlers.cc.patch

[mariospr]

Description

This patch could be removed in favour of a chromium_src override to redefine ManifestURL::GetWebStoreURL() into a method that unconditionally returns an empty GURL

Desktop Brave version:

Brave 1.23.1 (Chromium 89.0.4389.58)

Miscellaneous Information:

This removal references a patch initially introduced with brave/brave-core#215

[stephendonner]

Verified PASSED using the testplan from brave/brave-core#8065

Brave	1.23.23 Chromium: 89.0.4389.72 (Official Build) nightly (x86_64)
Revision	3f345f156bfd157bd1bea06310e55f3fb2490359-refs/branch-heads/4389@{#1393}
OS	macOS Version 11.2.3 (Build 20D91)

Verified that the PDF Viewer extension is bundled and not attributed to the Chrome Web Store, when launching with:

--args --enable-logging=stderr --vmodule="*/bat-native-ledger/*"=6,"*/brave_rewards/*"=6,"*/bat-native-ads/*"=6,"*/bat-native-confirmations/*"=6,"*/brave_ads/*"=6,"*/brave_user_model/*"=6 --brave-ads-staging --rewards=staging=true --show-component-extension-options

---

Verification passed on

Brave | 1.23.52 Chromium: 89.0.4389.105 (Official Build) dev (64-bit)
-- | --
Revision | 14f44e21a9d539cd49c72468a29bfca4fa43f710-refs/branch-heads/4389_90@{#7}
OS | Windows 10 OS Version 2004 (Build 19041.867)

Verified that the PDF Viewer extension is bundled and not attributed to the Chrome Web Store, when launching with:

---

Verified passed with

Brave	1.23.63 Chromium: 89.0.4389.114 (Official Build) beta (64-bit)
Revision	1ea76e193b4fadb723bfea2a19a66c93a1bc0ca6-refs/branch-heads/4389@{#1616}
OS	Linux

Verified the test plan from brave/brave-core#8065 (comment) when launching with --args --enable-logging=stderr --show-component-extension-options:

[srirambv]

Removing OS/Android label as PDF is handled natively in Android and chrome://extensions doesn't resolve as extension support is not available on Android