Make exclude_unwind_tables only dependent on is_official_build

This is an optimization setting, not a branding setting, so
it shouldn't look at is_chrome_branded.

No behavior change for builds covered by our bots, but it
might enable the setting for out-of-tree forks.

Bug: none
Change-Id: I8444cc4d01bf654ae2c6d46662fa6a142b08c0de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1593404
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656113}

build/config/compiler/compiler.gni

@@ -83,9 +83,9 @@ 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 &&
-                         !cast_is_debug && !is_fuchsia)
+exclude_unwind_tables =
+    is_official_build || (is_chromecast && !is_cast_desktop_build &&
+                          !is_debug && !cast_is_debug && !is_fuchsia)
 
 # If true, optimize for size. Does not affect windows builds.
 # Linux & Mac favor speed over size.