Remove an unused assignment in computed_hashes.cc

Bug: None
Test: None, cleanup.
Change-Id: I3c93a64cbd5e998487b8aee729860231d44009e5
Reviewed-on: https://chromium-review.googlesource.com/744323Reviewed-by: catmullings <catmullings@chromium.org>
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512890}

extensions/browser/computed_hashes.cc

@@ -69,7 +69,6 @@ bool ComputedHashes::Reader::InitFromFile(const base::FilePath& path) {
       return false;
     if (block_size <= 0 || ((block_size % 1024) != 0)) {
       LOG(ERROR) << "Invalid block size: " << block_size;
-      block_size = 0;
       return false;
     }