Remove the protobuf based HTTP upload code path

Now that Gerrit2 has been released and the only supported upload
protocol is direct git push over SSH we no longer need the large
and complex protobuf client library, or the upload chunking logic
in gerrit_upload.py.

Signed-off-by: Shawn O. Pearce <sop@google.com>

Makefile

@@ -13,17 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-GERRIT_SRC=../gerrit
-GERRIT_MODULES=codereview froofle
-
 all:
 
 clean:
 	find . -name \*.pyc -type f | xargs rm -f
-
-update-pyclient:
-	$(MAKE) -C $(GERRIT_SRC) release-pyclient
-	rm -rf $(GERRIT_MODULES)
-	(cd $(GERRIT_SRC)/release/pyclient && \
-	 find . -type f \
-	 | cpio -pd $(abspath .))