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_transport_fake.h b/buffet/http_transport_fake.h
index 590cc66..7905f3e 100644
--- a/buffet/http_transport_fake.h
+++ b/buffet/http_transport_fake.h
@@ -16,7 +16,7 @@
 #include "buffet/http_transport.h"
 #include "buffet/http_utils.h"
 
-namespace chromeos {
+namespace buffet {
 namespace http {
 namespace fake {
 
@@ -218,6 +218,6 @@
 
 }  // namespace fake
 }  // namespace http
-}  // namespace chromeos
+}  // namespace buffet
 
 #endif  // BUFFET_HTTP_TRANSPORT_FAKE_H_