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This is a reland of 961ea628
Chromium r550608 has rolled clang to r329921, which includes the build fix.

Original change's description:
> Revert "Add more unbundle packages to sysroots"
>
> This reverts commit b828d53c.
>
> Reason for revert: Causing a build failure on Google Chrome Linux x64
> https://ci.chromium.org/buildbot/chromium.chrome/Google%20Chrome%20Linux%20x64/29741
>
> /b/c/b/Google_Chrome_Linux_x64/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: duplicate symbol: exp2f@GLIBC_2.2.5
> >>> defined in obj/third_party/swiftshader/src/OpenGL/compiler/swiftshader_opengl_compiler/Intermediate.o
> >>> defined in obj/third_party/swiftshader/src/Renderer/swiftshader_renderer/Context.o
> /b/c/b/Google_Chrome_Linux_x64/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: duplicate symbol: exp2f@GLIBC_2.2.5
> >>> defined in obj/third_party/swiftshader/src/OpenGL/compiler/swiftshader_opengl_compiler/Intermediate.o
> >>> defined in obj/third_party/swiftshader/src/Renderer/swiftshader_renderer/Sampler.o
> /b/c/b/Google_Chrome_Linux_x64/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: duplicate symbol: powf@GLIBC_2.2.5
> >>> defined in obj/third_party/swiftshader/src/Renderer/swiftshader_renderer/Surface.o
> >>> defined in obj/third_party/swiftshader/src/Shader/swiftshader_shader/Constants.o
> /b/c/b/Google_Chrome_Linux_x64/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: duplicate symbol: powf@GLIBC_2.2.5
> >>> defined in obj/third_party/swiftshader/src/Renderer/swiftshader_renderer/Surface.o
> >>> defined in obj/third_party/swiftshader/src/Common/swiftshader_common/Math.o
>
> Original change's description:
> > Add more unbundle packages to sysroots
> >
> > The new packages are necessary to test unbundling of flac, libxslt, and zlib.
> >
> > BUG=800977
> > R=​thestig
> > TBR=mark
> >
> > Change-Id: I2c5f88b3819ce000e906cf303fdffa30bdde84cb
> > Reviewed-on: https://chromium-review.googlesource.com/981451
> > Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
> > Reviewed-by: Lei Zhang <thestig@chromium.org>
> > Reviewed-by: Nico Weber <thakis@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#549303}
>
> TBR=thakis@chromium.org,thestig@chromium.org,thomasanderson@chromium.org,mark@chromium.org
>
> Change-Id: I90188d22140d7cdd60f8bbea5b0e88705e498988
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 800977
> Reviewed-on: https://chromium-review.googlesource.com/1003532
> Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#549314}

Bug: 800977
Change-Id: I6b5deb3cd3c2d6ab77dfd904eb641744b88d2231
Reviewed-on: https://chromium-review.googlesource.com/1012903Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551339}