Add missing dependency in base_win64.

BUG=477851

Review URL: https://codereview.chromium.org/1090223002

Cr-Commit-Position: refs/heads/master@{#325708}


CrOS-Libchrome-Original-Commit: cff5a0c6ca6dcaf284b43cd6a8984e6bdffb6aa4
diff --git a/base/base.gyp b/base/base.gyp
index 1d6ba34..5fa2094 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -1119,6 +1119,7 @@
             'allocator/allocator.gyp:allocator_extension_thunks_win64',
             '../third_party/modp_b64/modp_b64.gyp:modp_b64_win64',
             'third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations_win64',
+            'trace_event/etw_manifest/etw_manifest.gyp:etw_manifest',
           ],
           # TODO(gregoryd): direct_dependent_settings should be shared with the
           # 32-bit target, but it doesn't work due to a bug in gyp