mac: Support 32-bit x86 builds

Updates mini_chromium to 471390dc9c5a.

471390dc9c5a mac: Support 32-bit x86 builds

% gn gen out/debug_32 --args='target_cpu="x86"'
% ninja -C out/debug_32

The 10.14 SDK does not contain support to link for 32-bit x86, so with
Xcode 10, it may be necessary to set the GN argument mac_sdk=10.13 (or
lower) or target_sysroot to an equivalent path. It may also be necessary
to coax Xcode into accepting this SDK.

Change-Id: I251c870ae06e2a7d9e6d8936240f204da2f4a517
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/1529224
Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
diff --git a/DEPS b/DEPS
index 4bb7d65..861d1ec 100644
--- a/DEPS
+++ b/DEPS
@@ -30,7 +30,7 @@
       '8bee09f4a57807136593ddc906b0b213c21f9014',
   'crashpad/third_party/mini_chromium/mini_chromium':
       Var('chromium_git') + '/chromium/mini_chromium@' +
-      'df0c375531b7cd554e10ad757c5d2372780a1138',
+      '471390dc9c5a4244364c0f9c5d463ebc78083e2b',
   'crashpad/third_party/libfuzzer/src':
       Var('chromium_git') + '/chromium/llvm-project/compiler-rt/lib/fuzzer.git@' +
       'fda403cf93ecb8792cb1d061564d89a6553ca020',