platform2: Fix issues with new version of libchrome

libchrome r334380 has the following breaking changes that need to be fixed:
- base::JSONWriter::Write() and base::JSONWriter::WriteWithOptions() take
  "const base::Value&" instead of "const base::Value*"
- base::JSONReader::Read() and base::JSONReader::ReadAndReturnError()
  return a scoped_ptr<base::Value> instead of base::Value*
- base/safe_strerror_posix.h is moved to base/posix/safe_strerror.h
- safe_strerror() is now in "base" namespace
- StartsWithASCII(), EndsWith(), StringToUpperASCII(), LowerCaseEqualsASCII()
  are now in "base" namespace
- ObserverList<T> is now in "base" namespace
- base::PrintTo(base::FilePath) used in gtest is now moved to libchrome-test
  library and as such, unit test runners need to link to this library now.
- crypto::RSAPrivateKey::CreateSensitive() is now removed from //crypto, so
  some of tests in chromeos-login that used that function had to be changed
  to use crypto::GenerateRSAKeyPairNSS() directly.
- UnixDomanSocket class is now in "base" namespace
- Pickle class is now in "base" namespace

BUG=chromium:496469
TEST=`./build_packages`
CQ-DEPEND=CL:277662

Change-Id: I36e5fbf2e36a92068873ffbd44020c862a3ed9e3
Reviewed-on: https://chromium-review.googlesource.com/277671
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
Trybot-Ready: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/omaha_response_handler_action.cc b/omaha_response_handler_action.cc
index 3e6f5d2..67639cc 100644
--- a/omaha_response_handler_action.cc
+++ b/omaha_response_handler_action.cc
@@ -166,7 +166,7 @@
 
   // If we're using p2p, |install_plan_.download_url| may contain a
   // HTTP URL even if |response.payload_urls| contain only HTTPS URLs.
-  if (!StartsWithASCII(install_plan_.download_url, "https://", false)) {
+  if (!base::StartsWithASCII(install_plan_.download_url, "https://", false)) {
     LOG(INFO) << "Mandating hash checks since download_url is not HTTPS.";
     return true;
   }
@@ -181,7 +181,7 @@
   // on. It's really hard to do book-keeping based on each byte being
   // downloaded to see whether we only used HTTPS throughout.
   for (size_t i = 0; i < response.payload_urls.size(); i++) {
-    if (!StartsWithASCII(response.payload_urls[i], "https://", false)) {
+    if (!base::StartsWithASCII(response.payload_urls[i], "https://", false)) {
       LOG(INFO) << "Mandating payload hash checks since Omaha response "
                 << "contains non-HTTPS URL(s)";
       return true;