Now that clang-3.8 is whitelisted on travis, try that.

.travis.yml

@@ -12,30 +12,20 @@ os:
   - linux
   # - osx
 
-# TODO(benvanik): re-enable when clang-3.8 is whitelisted.
-# https://github.com/travis-ci/apt-package-whitelist/issues/474
-#addons:
-#  apt:
-#    sources:
-#      - llvm-toolchain-precise
-#    packages:
-#      - clang-3.8
-#      - clang-format-3.8
+sudo: false
+addons:
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test
+      - llvm-toolchain-precise
+    packages:
+      - clang-3.8
+      - clang-format-3.8
 
 git:
   # We handle submodules ourselves in xenia-build setup.
   submodules: false
 
-before_install:
-  - sudo -E apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-  - gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.7QGyKksfYF --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d//apt.postgresql.org.gpg --keyserver hkp://keyserver.ubuntu.com:80/ --recv 60C317803A41BA51845E371A1E9377A2BA9EF27F
-  - sudo add-apt-repository "deb http://llvm.org/apt/precise/ llvm-toolchain-precise main" -y
-  - wget -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add -
-  - sudo apt-get -yq update
-
-install:
-  - sudo apt-get -yq --force-yes install clang-3.8 clang-format-3.8
-
 before_script:
   # Dump useful info.
   - $CXX --version