Update docs about code coverage on full Chromium

Running full Chromium with code coverage no longer requires disabling
the sandbox. It was fixed in 2019.

Found while working on crbug.com/1399354

Bug: None, 972232
No-Try: True
Change-Id: Ieeb86f162ebc0f955ace8d511ee3bf7c9b61cf92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4129804
Reviewed-by: Zhaoyang Li <[email protected]>
Commit-Queue: Kai Ninomiya <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1089024}
diff --git a/docs/testing/code_coverage.md b/docs/testing/code_coverage.md
index ad2f0bb..9ddebd6f 100644
--- a/docs/testing/code_coverage.md
+++ b/docs/testing/code_coverage.md
@@ -284,10 +284,9 @@
 code coverage instrumentation enabled. However, there are some inconveniences
 involved:
 
-* Linking may take a while
-* The binary is huge (~4GB)
-* The browser "works", but is noticeably slow and laggy
-* The sandbox needs to be disabled (`--no-sandbox`)
+* Linking may take a while, especially if you use a non-component build.
+* The binary is huge (2-4GB).
+* The browser may be noticeably slow and laggy.
 
 For more information, please see [crbug.com/834781].