Fix some ENABLE_EXTENSIONS macros in ChromeContentRendererClient

Some of these should be ENABLE_EXTENSIONS_CORE to compile the code in
for desktop Android. I just happened to notice these in passing.
Some ENABLE_EXTENSIONS are left as-is, specifically those related to
NaCl and to plugins.

Bug: none
Test: existing browser_tests
Change-Id: Ib2c5b09f4d80f18cfb7ff9684c2a6f3561739ba5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6192597
Reviewed-by: Emilia Paz <emiliapaz@chromium.org>
Commit-Queue: Emilia Paz <emiliapaz@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1410426}