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/omaha_response_handler_action_unittest.cc b/omaha_response_handler_action_unittest.cc
index 4af21b4..80aad60 100644
--- a/omaha_response_handler_action_unittest.cc
+++ b/omaha_response_handler_action_unittest.cc
@@ -52,7 +52,7 @@
 };
 
 namespace {
-const string kLongName =
+const char* const kLongName =
     "very_long_name_and_no_slashes-very_long_name_and_no_slashes"
     "very_long_name_and_no_slashes-very_long_name_and_no_slashes"
     "very_long_name_and_no_slashes-very_long_name_and_no_slashes"
@@ -61,8 +61,8 @@
     "very_long_name_and_no_slashes-very_long_name_and_no_slashes"
     "very_long_name_and_no_slashes-very_long_name_and_no_slashes"
     "-the_update_a.b.c.d_DELTA_.tgz";
-const string kBadVersion = "don't update me";
-}  // namespace {}
+const char* const kBadVersion = "don't update me";
+}  // namespace
 
 bool OmahaResponseHandlerActionTest::DoTestCommon(
     FakeSystemState* fake_system_state,
@@ -76,7 +76,7 @@
 
   ObjectFeederAction<OmahaResponse> feeder_action;
   feeder_action.set_obj(in);
-  if (in.update_exists and in.version != kBadVersion) {
+  if (in.update_exists && in.version != kBadVersion) {
     EXPECT_CALL(*(fake_system_state->mock_prefs()),
                 SetString(kPrefsUpdateCheckResponseHash, in.hash))
         .WillOnce(Return(true));