mac: Disable unit_tests WebAppShortcutCreatorTest.RevealAppShimInFinder

This test is flaky (sometimes crashes) on "Mac10.10 Tests".

TBR=tapted@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Bug: 741642
Change-Id: I53925b699979d967d3e3aa1df73436dfefdcbd57
Reviewed-on: https://chromium-review.googlesource.com/568100
Commit-Queue: Mark Mentovai <mark@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485938}

chrome/browser/web_applications/web_app_mac_unittest.mm

@@ -324,7 +324,8 @@ TEST_F(WebAppShortcutCreatorTest, UpdateIcon) {
   EXPECT_EQ(product_logo.Height(), [image size].height);
 }
 
-TEST_F(WebAppShortcutCreatorTest, RevealAppShimInFinder) {
+// Disabled, sometimes crashes on "Mac10.10 tests". https://crbug.com/741642
+TEST_F(WebAppShortcutCreatorTest, DISABLED_RevealAppShimInFinder) {
   WebAppShortcutCreatorMock shortcut_creator(app_data_dir_, info_.get());
   EXPECT_CALL(shortcut_creator, GetApplicationsDirname())
       .WillRepeatedly(Return(destination_dir_));