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_unittest.cc b/payload_signer_unittest.cc
index 086e54a..829fdd8 100644
--- a/payload_signer_unittest.cc
+++ b/payload_signer_unittest.cc
@@ -77,8 +77,6 @@
   0x29, 0x93, 0x43, 0xc7, 0x43, 0xb9, 0xab, 0x7d
 };
 
-//class PayloadSignerTest : public ::testing::Test {};
-
 namespace {
 void SignSampleData(vector<char>* out_signature_blob) {
   string data_path;
@@ -99,7 +97,7 @@
       out_signature_blob));
   EXPECT_EQ(length, out_signature_blob->size());
 }
-}
+}  // namespace
 
 TEST(PayloadSignerTest, SimpleTest) {
   vector<char> signature_blob;