Hide WrapUnique() -> MakeUnique() change from blame

There are a large number of mechanical changes of usages of WrapUnique()
to MakeUnique(). The blame information for these is not useful as it
does not reflect the people responsible for the code.

Add the relevant commits to .git-blame-ignore-revs so that they will be
skipped by git hyper-blame.

R=mgiuca@chromium.org
BUG=637812

Review-Url: https://codereview.chromium.org/2288683002
Cr-Commit-Position: refs/heads/master@{#418833}

.git-blame-ignore-revs

@@ -341,3 +341,50 @@ f5f08765522594f41a1c032754e4fbc30e90c134
 
 # clang-format all of //ash
 b8dcef526018a47e7cd985cef724c464d0d958a6
+
+# Re-write many calls to WrapUnique() with MakeUnique()
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