Do not setup clang as the default compiler in Travis.

clang-7.

.travis.yml

@@ -9,10 +9,9 @@ matrix:
         apt:
           sources:
             - ubuntu-toolchain-r-test
-            - 'llvm-toolchain-xenial-7'
             - sourceline: 'ppa:jonathonf/ffmpeg-4'
           packages:
-            - clang-7 g++-7
+            - g++-7
             - libswresample-dev libswscale-dev libavcodec-dev libavformat-dev libavresample-dev
             - libglib2.0-dev
             - unzip

.travis_linux_install.sh

@@ -14,7 +14,7 @@ if ! [ -d $TRAVIS_CACHE_DIR/third_party/skia/out/Release ]; then
     wget https://github.com/ninja-build/ninja/releases/download/v1.9.0/ninja-linux.zip
     unzip ninja-linux.zip
     chmod +x ninja
-    bin/gn gen out/Release --args='is_official_build=true is_debug=false extra_cflags=["-Wno-error"] target_os="linux" target_cpu="x64" skia_use_system_expat=false skia_use_system_freetype2=false skia_use_system_libjpeg_turbo=false skia_use_system_libpng=false skia_use_system_libwebp=false skia_use_system_zlib=false skia_use_system_icu=false skia_use_system_harfbuzz=false cc="clang-7" cxx="clang++-7"'
+    bin/gn gen out/Release --args='is_official_build=true is_debug=false extra_cflags=["-Wno-error"] target_os="linux" target_cpu="x64" skia_use_system_expat=false skia_use_system_freetype2=false skia_use_system_libjpeg_turbo=false skia_use_system_libpng=false skia_use_system_libwebp=false skia_use_system_zlib=false skia_use_system_icu=false skia_use_system_harfbuzz=false cc="clang" cxx="clang++"'
     ./ninja -C out/Release -j 2 skia
     mkdir -p $TRAVIS_CACHE_DIR/third_party/skia/out/Release
     cp -r ./out/Release/* $TRAVIS_CACHE_DIR/third_party/skia/out/Release