Merge pull request #1341 from jcanizales/merge-https-upstream

gRPC.podspec

src/objective-c/GRPCClient/private/GRPCChannel.h

src/objective-c/GRPCClient/private/GRPCChannel.m

src/objective-c/GRPCClient/private/GRPCSecureChannel.h

src/objective-c/GRPCClient/private/GRPCSecureChannel.m

src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.h

src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.m

src/objective-c/examples/Sample/Podfile

src/objective-c/examples/Sample/RemoteTestClient/Empty.pb.h

src/objective-c/examples/Sample/RemoteTestClient/Empty.pb.m

...bjective-c/examples/Sample/RemoteTestClient/Messages.pb.h

...bjective-c/examples/Sample/RemoteTestClient/Messages.pb.m

...ive-c/examples/Sample/RemoteTestClient/RemoteTest.podspec

src/objective-c/examples/Sample/RemoteTestClient/Test.pb.h

src/objective-c/examples/Sample/RemoteTestClient/Test.pb.m

src/objective-c/examples/Sample/RemoteTestClient/empty.proto

...jective-c/examples/Sample/RemoteTestClient/messages.proto

src/objective-c/examples/Sample/RemoteTestClient/test.proto

...ctive-c/examples/Sample/RouteGuideClient/Route_guide.pb.h

...ctive-c/examples/Sample/RouteGuideClient/Route_guide.pb.m