Remove CFI blacklists entries for the fixed bug.

BUG=568891

Review-Url: https://codereview.chromium.org/2445033002
Cr-Commit-Position: refs/heads/master@{#427126}

tools/cfi/blacklist.txt

@@ -58,11 +58,6 @@ fun:*DatabaseContext*contextDestroyed*
 # so exclude source file for now. 
 src:*LifecycleObserver.h*
 
-# Blink wtf::Vector cast on non-initialized data
-# https://crbug.com/568891
-src:*wtf/Vector.h*
-src:*wtf/PartitionAllocator.h*
-
 #############################################################################
 # Methods disabled due to perf considerations.