update_engine: fixed warnings from cpplint

Fixed all the cpplint warnings in update engine.

BUG=None
TEST=Unit tests still pass.

Change-Id: I285ae858eec8abe0b26ff203b99a42a200ceb71c
Reviewed-on: https://chromium-review.googlesource.com/204027
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/payload_signer.cc b/payload_signer.cc
index a3ac5b9..15c2b32 100644
--- a/payload_signer.cc
+++ b/payload_signer.cc
@@ -133,7 +133,6 @@
 
   // Is there already a signature op in place?
   if (manifest.has_signatures_size()) {
-
     // The signature op is tied to the size of the signature blob, but not it's
     // contents. We don't allow the manifest to change if there is already an op
     // present, because that might invalidate previously generated
@@ -177,7 +176,7 @@
   LOG(INFO) << "Signature Blob Offset: " << *out_signatures_offset;
   return true;
 }
-}  // namespace {}
+}  // namespace
 
 bool PayloadSigner::LoadPayload(const string& payload_path,
                  vector<char>* out_payload,