Delete unused coverage recipe code.

tools/llvm_coverage_build

Index: tools/llvm_coverage_build
diff --git a/tools/llvm_coverage_build b/tools/llvm_coverage_build
deleted file mode 100755
index 85e9db964167ae7ae95ffaf8bdee37208d459f45..0000000000000000000000000000000000000000
--- a/tools/llvm_coverage_build
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/bin/bash
-# Copyright (c) 2015 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# Build Skia for use with LLVM's coverage tools.
-#
-# $ tools/llvm_coverage_build [any other flags to pass to make...]
-#
-# This script assumes the use of Clang 3.6. Earlier versions do not support
-# the flags we use in the build, and 3.7+ hit asserts during compilation.
-#
-set -e
-
-export CC="${CC:-$(which clang)}"
-export CXX="${CXX:-$(which clang++)}"
-
-if [[ -z "${CC}" ]] || [[ -z "${CXX}" ]]; then
-  echo "Couldn't find Clang on this machine!"
-  exit 1
-fi
-
-echo "CC=$CC"
-echo "CXX=$CXX"
-$CC --version
-
-export GYP_DEFINES="skia_clang_build=1"
-export BUILDTYPE=Coverage
-make $@