docs: Replace remove_webcore_debug_symbols with blink_symbol_level=0

remove_webcore_debug_symbols is deprecated.

Bug: none
Change-Id: I85a5ec66f10b94fb5949e932601743d479a9a178
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1518753
Auto-Submit: James Cook <[email protected]>
Commit-Queue: Takuto Ikuta <[email protected]>
Reviewed-by: Takuto Ikuta <[email protected]>
Cr-Commit-Position: refs/heads/master@{#640123}
2 files changed