Bug 853128 - Turn off injecting test of NtFlushBuffersFile on x64. r=ehsan
Backed out changeset 8a9a40bfa8e3 (bug 853151) for browser_social_markButton.js failures

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rename : browser/base/content/test/social/social_mark_image.png => browser/base/content/test/social/social_share_image.png