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_connection_curl.h b/buffet/http_connection_curl.h
index d588854..9a82e26 100644
--- a/buffet/http_connection_curl.h
+++ b/buffet/http_connection_curl.h
@@ -14,12 +14,12 @@
 
 #include "buffet/http_connection.h"
 
-namespace chromeos {
+namespace buffet {
 namespace http {
 namespace curl {
 
 // This is a libcurl-based implementation of http::Connection.
-class Connection : public chromeos::http::Connection {
+class Connection : public http::Connection {
  public:
   Connection(CURL* curl_handle, const std::string& method,
              std::shared_ptr<http::Transport> transport);
@@ -81,6 +81,6 @@
 
 }  // namespace curl
 }  // namespace http
-}  // namespace chromeos
+}  // namespace buffet
 
 #endif  // BUFFET_HTTP_CONNECTION_CURL_H_