Reland "[Lighthouse] Rename Audits panel to Lighthouse"

This reverts commit 065146856295c7ebf01d538820d3f2e60c383335.

Reason for revert: Cause of failure has been remedied. See: https://chromium-review.googlesource.com/c/chromium/src/+/2055398

Original change's description:
> Revert "[Lighthouse] Rename Audits panel to Lighthouse"
>
> This reverts commit 2ae53ef04d84c4201836eb63238e97bc180ea54d.
>
> Reason for revert: This CL breaks CI: https://ci.chromium.org/p/devtools-frontend/builders/ci/DevTools%20Linux/453. It looks like the layout test expects audits not lighthouse in the name, so it's probably in need of a 3-way merge.
>
> Original change's description:
> > [Lighthouse] Rename Audits panel to Lighthouse
> >
> > Change-Id: Ia2ab175d2a3b6c8ded73aff8ff0f5582f5a8fa0c
> > Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2044605
> > Commit-Queue: Connor Clark <[email protected]>
> > Reviewed-by: Tim van der Lippe <[email protected]>
> > Reviewed-by: Paul Irish <[email protected]>
>
> [email protected],[email protected],[email protected],[email protected]
>
> Change-Id: Ia6d5f42a0e6ece4352696c51bf0de5754774cb0a
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2051983
> Reviewed-by: Paul Lewis <[email protected]>
> Commit-Queue: Paul Lewis <[email protected]>

[email protected],[email protected],[email protected],[email protected]

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1052111
Change-Id: I638ca9bd5cd94e02fb7318f2a7d7c66fca40e6c8
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2056866
Reviewed-by: Connor Clark <[email protected]>
Reviewed-by: Paul Irish <[email protected]>
Reviewed-by: Tim van der Lippe <[email protected]>
Commit-Queue: Connor Clark <[email protected]>
diff --git a/front_end/externs.js b/front_end/externs.js
index 93a5f79..2c86b44 100644
--- a/front_end/externs.js
+++ b/front_end/externs.js
@@ -1171,22 +1171,15 @@
  */
 DetailsRenderer.OpportunitySummary;
 
-const Lighthouse = {};
-
-Lighthouse.ReportGenerator = {};
-
-/**
- * @param {!ReportRenderer.ReportJSON} lhr
- * @return {string}
- */
-Lighthouse.ReportGenerator.generateReportHtml;
-
-/**
- * @param {string} source
- * @param {Array<{search: string, replacement: string}>} replacements
- * @return {string}
- */
-Lighthouse.ReportGenerator.replaceStrings;
+const LighthouseReportGenerator = class {
+  /**
+   * @param {!ReportRenderer.ReportJSON} lhr
+   * @return {string}
+   */
+  generateReportHtml(lhr) {
+    return '';
+  }
+};
 
 /** @interface */
 class InspectorFrontendHostAPI {