fix: add a missing data dependency

Our Windows on Arm testing setup relies on using GN to extract the
runtime_deps of each test suite. All but one test
(PrefetchStoreSchemaTest.TestCreateOrMigrate) pass once this is added
(the remaining failure is because different line-endings are used on
Windows).

Change-Id: I754d0d9c001ebd16b474fe7dcfad83850d16e003
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107869Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Cr-Commit-Position: refs/heads/master@{#756628}

components/offline_pages/BUILD.gn

@@ -17,6 +17,12 @@ if (!is_ios) {
       "//components/test:run_all_unittests",
     ]
 
+    if (!is_fuchsia) {
+      # On Fuchsia, components/test/data seems to change spuriously,
+      # breaking incremental compilation.
+      data = [ "../test" ]
+    }
+
     if (is_android) {
       # renovations tests depend on content shell and UI.  For some reason.
       # these deps need to be on the test() target and not the source_set