Remove cfi_icall_generalize_pointers from BoringSSL.

BoringSSL should be clean w.r.t. this flag now.

Bug: 785442
Change-Id: I8fa8b2589c82a7c446a01d96c4702a2d1535de1e
Reviewed-on: https://chromium-review.googlesource.com/c/1289160Reviewed-by: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600902}

third_party/boringssl/BUILD.gn

@@ -31,7 +31,6 @@ config("internal_config") {
     # TODO(davidben): Fix size_t truncations in BoringSSL.
     # https://crbug.com/boringssl/22
     "//build/config/compiler:no_size_t_to_int_warning",
-    "//build/config/sanitizers:cfi_icall_generalize_pointers",
   ]
   if (is_posix || is_fuchsia) {
     cflags_c = [ "-std=c99" ]