[Fuchsia] Stop enabling shadow-call-stack explicitly

shadow-call-stack is enabled by default on Fuchsia now, so we no longer
need to enable it explicitly.

Bug: 821951
Change-Id: I221bc557bf93dfd5bf7c1659f7f8dfc32129c6b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898631
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714312}

build/config/fuchsia/BUILD.gn

@@ -49,14 +49,6 @@ config("compiler") {
   # Add SDK lib dir for -lfdio above.
   lib_dirs = [ "${fuchsia_sdk}/arch/${current_cpu}/lib" ]
 
-  # TODO(crbug.com/821951): Clang enables SafeStack by default when targeting
-  # Fuchsia, but it breaks some tests, notably in V8.
-  # Force the toolchain to use shadow-call-stack instead, until that is default.
-  cflags += [
-    "-fno-sanitize=safe-stack",
-    "-fsanitize=shadow-call-stack",
-  ]
-
   libs = [ "zircon" ]
 }