Don't exclude unwind tables on fuchsia chromecast builds

Release non-official builds are used for dev purposes, so it's useful
to have backtraces.

Bug: Internal 67965579
Change-Id: I91f2642ed27acb06255aa4d43db1e39e50c863f3
Reviewed-on: https://chromium-review.googlesource.com/728727Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510220}

build/config/compiler/compiler.gni

@@ -77,8 +77,9 @@ assert(!is_cfi || use_thin_lto, "CFI requires ThinLTO")
 # For unofficial (e.g. development) builds and non-Chrome branded (e.g. Cronet
 # which doesn't use Crashpad, crbug.com/479283) builds it's useful to be able
 # to unwind at runtime.
-exclude_unwind_tables = (is_chrome_branded && is_official_build) ||
-                        (is_chromecast && !is_cast_desktop_build && !is_debug)
+exclude_unwind_tables =
+    (is_chrome_branded && is_official_build) ||
+    (is_chromecast && !is_cast_desktop_build && !is_debug && !is_fuchsia)
 
 # If true, optimize for size. Does not affect windows builds.
 # Linux & Mac favor speed over size.