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Delete Travis config file

PiperOrigin-RevId: 378483262

.travis.yml

@@ -1,61 +0,0 @@
-# Build matrix / environment variable are explained on:
-# https://docs.travis-ci.com/user/customizing-the-build/
-# This file can be validated on:
-# http://lint.travis-ci.org/
-
-language: cpp
-
-# Define the matrix explicitly, manually expanding the combinations of (os, compiler, env).
-# It is more tedious, but grants us far more flexibility.
-matrix:
-  include:
-    - os: linux
-      dist: bionic
-      compiler: gcc
-      install: ./ci/install-linux.sh && ./ci/log-config.sh
-      script: ./ci/build-linux-bazel.sh
-    - os: linux
-      dist: bionic
-      compiler: clang
-      install: ./ci/install-linux.sh && ./ci/log-config.sh
-      script: ./ci/build-linux-bazel.sh
-    - os: linux
-      dist: bionic
-      compiler: gcc
-      env: BUILD_TYPE=Debug CXX_FLAGS="-std=c++11 -Wdeprecated"
-    - os: linux
-      dist: bionic
-      compiler: clang
-      env: BUILD_TYPE=Release CXX_FLAGS="-std=c++11 -Wdeprecated" NO_EXCEPTION=ON NO_RTTI=ON COMPILER_IS_GNUCXX=ON
-    - os: osx
-      osx_image: xcode12.2
-      compiler: gcc
-      env: BUILD_TYPE=Release CC=gcc-10 CXX=g++-10 CXX_FLAGS="-std=c++11 -Wdeprecated" HOMEBREW_LOGS=~/homebrew-logs HOMEBREW_TEMP=~/homebrew-temp
-    - os: osx
-      osx_image: xcode12.2
-      compiler: clang
-      env: BUILD_TYPE=Release CXX_FLAGS="-std=c++11 -Wdeprecated" HOMEBREW_LOGS=~/homebrew-logs HOMEBREW_TEMP=~/homebrew-temp
-
-# These are the install and build (script) phases for the most common entries in the matrix.  They could be included
-# in each entry in the matrix, but that is just repetitive.
-install:
-  - ./ci/install-${TRAVIS_OS_NAME}.sh
-  - . ./ci/env-${TRAVIS_OS_NAME}.sh
-  - ./ci/log-config.sh
-
-script: ./ci/travis.sh
-
-# This section installs the necessary dependencies.
-addons:
-  apt:
-    packages:
-    - g++
-    - clang
-    update: true
-  homebrew:
-    packages:
-    - gcc@10
-    update: true
-
-notifications:
-  email: false