Silence the compile_assets issue in Xcode 9.2

Since Xcode 9.2 has a slightly different error messages regarding
assets on iPad and iOS < 10.0, add a broader regexp to silence them.

Bug: 770634
Change-Id: I428775722b19ac87ca9602681eae49e78bc78dac
Reviewed-on: https://chromium-review.googlesource.com/751522
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#513784}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 75bf824d0c9f8352702249fe2e99bb40284e272e

toolchain/mac/compile_xcassets.py

@@ -36,6 +36,11 @@ SPURIOUS_PATTERNS = map(re.compile, [
     # crbug.com/770634, likely a bug in Xcode 9.1 beta, remove once build
     # requires a version of Xcode with a fix.
     r'\[\]\[ipad\]\[76x76\]\[\]\[\]\[1x\]\[\]\[\]: notice: \(null\)',
+
+    # crbug.com/770634, likely a bug in Xcode 9.2 beta, remove once build
+    # requires a version of Xcode with a fix.
+    r'\[\]\[ipad\]\[76x76\]\[\]\[\]\[1x\]\[\]\[\]: notice: 76x76@1x app icons'
+    ' only apply to iPad apps targeting releases of iOS prior to 10.0.',
 ])
 
 # Map special type of asset catalog to the corresponding command-line