Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/.travis.yml

 sudo: required
-dist: trusty
 # Note: travis currently does not support listing more than one language so
 # this cheats and claims to only be cpp.  If they add multiple language
 # support, this should probably get updated to install steps and/or
 # rvm/gemfile/jdk/etc. entries rather than manually doing the work.
 language: cpp
 os:
+  - linux
   - osx
 # The Objective C build needs Xcode 7.0 or later.
-osx_image: xcode8.1
+osx_image: xcode7.2
 script:
   - ./tests.sh $CONFIG
 env:
   - CONFIG=cpp
   - CONFIG=cpp_distcheck
+  - CONFIG=csharp
   - CONFIG=golang
+  - CONFIG=java_jdk6
   - CONFIG=java_jdk7
   - CONFIG=java_oracle7
+  - CONFIG=javanano_jdk6
   - CONFIG=javanano_jdk7
   - CONFIG=javanano_oracle7
   - CONFIG=javascript
-  # iOS build log was starting to choke travis UI, so split to cover the
-  # Xcode Debug and Release Configurations independently.
-  - CONFIG=objectivec_ios_debug
-  - CONFIG=objectivec_ios_release
-  - CONFIG=objectivec_osx
-  - CONFIG=objectivec_cocoapods_integration
   - CONFIG=python
   - CONFIG=python_cpp
+  - CONFIG=ruby19
+  - CONFIG=ruby20
   - CONFIG=ruby21
   - CONFIG=ruby22
   - CONFIG=jruby
-  - CONFIG=php5.6_mac
 matrix:
   exclude:
     # It's nontrivial to programmatically install a new JDK from the command
     # line on OS X, so we rely on testing on Linux for Java code.
     - os: osx
+      env: CONFIG=java_jdk6
+    - os: osx
       env: CONFIG=java_jdk7
     - os: osx
       env: CONFIG=java_oracle7
     - os: osx
+      env: CONFIG=javanano_jdk6
+    - os: osx
       env: CONFIG=javanano_jdk7
     - os: osx
       env: CONFIG=javanano_oracle7
+    # Requires installing mono, currently travis.sh is doing that with apt-get
+    # which doesn't work on OS X.
+    - os: osx
+      env: CONFIG=csharp
     # Requires installing golang, currently travis.sh is doing that with apt-get
     # which doesn't work on OS X.
     - os: osx
       env: CONFIG=golang
+  # Add into the matrix OS X tests of Objective C (needs Xcode, so it won't
+  # work on other platforms). These are split so it doesn't take as long to run.
   include:
-    # The dotnet environment requires Ubuntu 14.04 or 16.04. This
-    # configuration is effectively an "extra" one, outside the
-    # autogenerated matrix.
-    - os: linux
-      env: CONFIG=csharp
-      dist: trusty
-    # This test is kept on travis because it doesn't play nicely with other
-    # tests on jenkins running in parallel.
-    - os: linux
-      env: CONFIG=cpp_distcheck
-    # The Java compatibility test currently only runs on Linux because it will
-    # fetch pre-built Linux protoc binaries in the test.
-    - os: linux
-      env: CONFIG=java_compatibility
+    - os: osx
+      env: CONFIG=objectivec_ios
+    - os: osx
+      env: CONFIG=objectivec_osx
   allow_failures:
     # These currently do not work on OS X but are being worked on by @haberman.
     - os: osx
       env: CONFIG=ruby22
     - os: osx
       env: CONFIG=jruby
     # https://github.com/google/protobuf/issues/1253 - Started failing when
     # we moved to an OS X image that is 10.11.
     - os: osx
       env: CONFIG=python_cpp
-    # Mark the iOS test as flakey as xcodebuild some times fails to start the
-    # iOS Simulator.
+    # xctool 0.2.8 seems to have a bug where it randomly kills tests saying
+    # they failed.
+    #   https://github.com/facebook/xctool/issues/619
+    #   https://github.com/google/protobuf/issues/1232
+    # travis updated their images to include 0.2.8:
+    #   https://blog.travis-ci.com/2016-03-23-xcode-image-updates
+    # Mark the iOS test as flakey so these failures don't turn things red.
     - os: osx
-      env: CONFIG=objectivec_ios_debug
-    - os: osx
-      env: CONFIG=objectivec_ios_release
+      env: CONFIG=objectivec_ios
 notifications:
   email: false