buffet: Remove 'chromeos' namespace and move everything to buffet NS

As discussed, moved all the classes out of chromeos namespace into
'buffet.

Also fixed a number of cpplint's warnings.

BUG=None
TEST=Everything still compiles and unit tests succeed.

Change-Id: Ide864acb2504627404966727f66d353af60e531d
Reviewed-on: https://chromium-review.googlesource.com/198971
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/buffet/http_request.cc b/buffet/http_request.cc
index 05860c5..df09ca4 100644
--- a/buffet/http_request.cc
+++ b/buffet/http_request.cc
@@ -12,7 +12,7 @@
 #include "buffet/mime_utils.h"
 #include "buffet/string_utils.h"
 
-namespace chromeos {
+namespace buffet {
 namespace http {
 
 // request_type
@@ -184,7 +184,7 @@
 bool Request::SendRequestIfNeeded(ErrorPtr* error) {
   if (transport_) {
     if (!connection_) {
-      chromeos::http::HeaderList headers = MapToVector(headers_);
+      http::HeaderList headers = MapToVector(headers_);
       std::vector<std::string> ranges;
       if (method_ != request_type::kHead) {
         ranges.reserve(ranges_.size());
@@ -221,7 +221,7 @@
     if (connection_)
       return true;
   } else {
-    Error::AddTo(error, chromeos::http::curl::kErrorDomain,
+    Error::AddTo(error, http::curl::kErrorDomain,
                  "request_already_received", "HTTP response already received");
   }
   return false;
@@ -294,4 +294,4 @@
 }
 
 }  // namespace http
-}  // namespace chromeos
+}  // namespace buffet