removing cpp:toolchain flag (#132)

diff --git a/bazelrc/bazel-0.15.0.bazelrc b/bazelrc/bazel-0.15.0.bazelrc
index c5ebd1b..3b38fc5 100644
--- a/bazelrc/bazel-0.15.0.bazelrc
+++ b/bazelrc/bazel-0.15.0.bazelrc
@@ -50,7 +50,6 @@
 # "extra_toolchains" to be selected (given constraints defined in
 # "exec_compatible_with").
 # More about platforms: https://docs.bazel.build/versions/master/platforms.html
-build:remote --enabled_toolchain_types=@bazel_tools//tools/cpp:toolchain_type
 build:remote --extra_toolchains=@bazel_toolchains//configs/ubuntu16_04_clang/1.0/bazel_0.15.0/cpp:cc-toolchain-clang-x86_64-default
 build:remote --extra_execution_platforms=@bazel_toolchains//configs/ubuntu16_04_clang/1.0:rbe_ubuntu1604
 build:remote --host_platform=@bazel_toolchains//configs/ubuntu16_04_clang/1.0:rbe_ubuntu1604
diff --git a/configs/debian8_clang/0.3.0/toolchain.bazelrc b/configs/debian8_clang/0.3.0/toolchain.bazelrc
index 1248454..ca2c979 100644
--- a/configs/debian8_clang/0.3.0/toolchain.bazelrc
+++ b/configs/debian8_clang/0.3.0/toolchain.bazelrc
@@ -13,14 +13,12 @@
 # "extra_toolchains" to be selected (given constraints defined in
 # "exec_compatible_with").
 # More about platforms: https://docs.bazel.build/versions/master/platforms.html
-build:remote --enabled_toolchain_types=@bazel_tools//tools/cpp:toolchain_type
 build:remote --extra_toolchains=@bazel_toolchains//configs/debian8_clang/0.3.0/bazel_0.15.0/cpp:cc-toolchain-clang-x86_64-default
 build:remote --extra_execution_platforms=@bazel_toolchains//configs/debian8_clang/0.3.0:rbe_debian8
 build:remote --host_platform=@bazel_toolchains//configs/debian8_clang/0.3.0:rbe_debian8
 build:remote --platforms=@bazel_toolchains//configs/debian8_clang/0.3.0:rbe_debian8
 
 # Experimental configs for sanitizers, use --config=remote,remote-xxsan,remote-<asan/tsan/msan> (in that order)
-# Sanitizer builds must not run with --enabled_toolchain_types=@bazel_tools//tools/cpp:toolchain_type.
 # See https://github.com/bazelbuild/bazel/issues/5291.
 build:remote-xxsan --copt=-gmlt
 build:remote-xxsan --strip=never
diff --git a/configs/ubuntu16_04_clang/1.0/toolchain.bazelrc b/configs/ubuntu16_04_clang/1.0/toolchain.bazelrc
index 5ec0ba1..99531ae 100644
--- a/configs/ubuntu16_04_clang/1.0/toolchain.bazelrc
+++ b/configs/ubuntu16_04_clang/1.0/toolchain.bazelrc
@@ -13,14 +13,12 @@
 # "extra_toolchains" to be selected (given constraints defined in
 # "exec_compatible_with").
 # More about platforms: https://docs.bazel.build/versions/master/platforms.html
-build:remote --enabled_toolchain_types=@bazel_tools//tools/cpp:toolchain_type
 build:remote --extra_toolchains=@bazel_toolchains//configs/ubuntu16_04_clang/1.0/bazel_0.15.0/cpp:cc-toolchain-clang-x86_64-default
 build:remote --extra_execution_platforms=@bazel_toolchains//configs/ubuntu16_04_clang/1.0:rbe_ubuntu1604
 build:remote --host_platform=@bazel_toolchains//configs/ubuntu16_04_clang/1.0:rbe_ubuntu1604
 build:remote --platforms=@bazel_toolchains//configs/ubuntu16_04_clang/1.0:rbe_ubuntu1604
 
 # Experimental configs for sanitizers, use --config=remote,remote-xxsan,remote-<asan/tsan/msan> (in that order)
-# Sanitizer builds must not run with --enabled_toolchain_types=@bazel_tools//tools/cpp:toolchain_type.
 # See https://github.com/bazelbuild/bazel/issues/5291.
 build:remote-xxsan --copt=-gmlt
 build:remote-xxsan --strip=never