DevTools: Replace the chrome-devtools:// URL scheme with a more generic
devtools:// scheme

This change replaces the chrome-devtools:// URL scheme, with a more
browser-agnostic equivalent.
Naturally, many files had to be touched, but it's mostly a
straightforward find/replace.

A related change is out against the catapult repo here:
https://chromium-review.googlesource.com/c/catapult/+/1606268,
which removes a test file containing the old scheme. Once it goes in,
the root DEPS file in the chromium repo needs to be updated as well.

Note:
This is a continuation of patch 1552143, but since Fabio is out on
leave and I don't have permissions to upload to his patch, I needed to
start a new one.

Bug: 960409
Change-Id: I3ede7f8d1dcbca457167eb3641ae60e9685d8d78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1582881
Commit-Queue: James Lissiak <[email protected]>
Reviewed-by: Joel Einbinder <[email protected]>
Reviewed-by: Tom Sepez <[email protected]>
Reviewed-by: Scott Violet <[email protected]>
Reviewed-by: Charlie Reis <[email protected]>
Cr-Commit-Position: refs/heads/master@{#659944}
diff --git a/docs/webui_explainer.md b/docs/webui_explainer.md
index 9524426..ecb4ccf 100644
--- a/docs/webui_explainer.md
+++ b/docs/webui_explainer.md
@@ -74,7 +74,7 @@
 
 Examples:
 
-* chrome-devtools:
+* devtools:
 * chrome-extensions:
 * chrome:
 * file: