[cr141] Updating mangling due to errors-button changes

Chromium changes:
https://chromium.googlesource.com/chromium/src/+/c15759e02d76abe43f7300e23affa8c7ead0a7d7

commit c15759e02d76abe43f7300e23affa8c7ead0a7d7
Author: Amit P <ponnan2112@gmail.com>
Date:   Fri Aug 15 16:18:51 2025 -0700

    [Extensions] Add "Warnings" text button on chrome://extensions

    Previously, the "Errors" button was shown even for benign manifest key
    warnings, which confused developers. This change updates the button to
    display "Warnings" if only unrecognized manifest key warnings are
    present, and "Errors" otherwise. Adds an i18n string and updates the UI
    logic accordingly.

    Bug: 406497235
    Change-Id: I5736992b5ae81c5949e3da952f8e909ea171def4
    Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6639214
    Commit-Queue: Oliver Dunk <oliverdunk@chromium.org>
    Reviewed-by: Solomon Kinard <solomonkinard@chromium.org>
    Reviewed-by: Oliver Dunk <oliverdunk@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#1502187}

tools/chromium_src/lit_mangler/__snapshots__/mangle.test.ts.snap

@@ -135,8 +135,8 @@ exports[`mangled files should have up to date snapshots ./chromium_src/chrome/br
          $i18n{remove}
        </cr-button>
        \${this.shouldShowErrorsButton_() ? html\`
-         <cr-button id=\\"errors-button\\" @click=\\"\${this.onErrorsClick_}\\"
-@@ -168,25 +163,14 @@
+         <cr-button id=\\"errors-button\\"
+@@ -172,25 +167,14 @@
        <cr-button id=\\"terminated-reload-button\\" @click=\\"\${this.onReloadClick_}\\"
            aria-describedby=\\"a11yAssociation\\" class=\\"action-button\\">
          $i18n{itemReload}