Convert GN single-item list concat to use lists.

tools/gn/secondary/skia/BUILD.gn

 # Copyright (c) 2013 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.
 
 enable_printing = true  # TODO(brettw) pass this feature flag in somehow.
 skia_support_gpu = !is_ios
 skia_support_pdf = !is_ios && enable_printing
 
 # External-facing config for dependent code.
 config("skia_config") {
@@ skipping 20 matching lines @@
   defines = [
     "SK_ENABLE_INST_COUNT=0",
     "GR_GL_CUSTOM_SETUP_HEADER=\"GrGLConfig_chrome.h\"",
   ]
 
   if (skia_support_gpu) {
     include_dirs += [
       "//third_party/skia/include/gpu",
       "//third_party/skia/src/gpu",
     ]
-    defines += "SK_SUPPORT_GPU=1"
+    defines += [ "SK_SUPPORT_GPU=1" ]
   } else {
-    defines += "SK_SUPPORT_GPU=0"
+    defines += [ "SK_SUPPORT_GPU=0" ]
   }
 
   # For POSIX platforms, prefer the Mutex implementation provided by Skia
   # since it does not generate static initializers.
   if (is_posix) {
-    defines += "SK_USE_POSIX_THREADS"
+    defines += [ "SK_USE_POSIX_THREADS" ]
   }
 
   if (is_android) {
     defines += [
       "SK_BUILD_FOR_ANDROID",
       "USE_CHROMIUM_SKIA",
     ]
   }
 }
 
@@ skipping 44 matching lines @@
   "ext/skia_utils_win.cc",
   "ext/skia_utils_win.h",
   "ext/vector_canvas.cc",
   "ext/vector_canvas.h",
   "ext/vector_platform_device_emf_win.cc",
   "ext/vector_platform_device_emf_win.h",
   "ext/vector_platform_device_skia.cc",
   "ext/vector_platform_device_skia.h",
 ]
 if (is_posix) {
-  skia_chrome_sources -= "ext/SkThread_chrome.cc"
+  skia_chrome_sources -= [ "ext/SkThread_chrome.cc" ]
 }
 if (is_ios) {
-  skia_chrome_sources -= "ext/vector_platform_device_skia.cc"
+  skia_chrome_sources -= [ "ext/vector_platform_device_skia.cc" ]
 }
 if (is_win) {
-  skia_chrome_sources -= "ext/SkThread_chrome.cc"
+  skia_chrome_sources -= [ "ext/SkThread_chrome.cc" ]
 }
 if (is_android && !enable_printing) {
   skia_chrome_sources -= [
     "ext/skia_utils_base.cc",
     "ext/vector_platform_device_skia.cc"
   ]
 }
 
 # Internal-facing config for Skia library code.
 config("skia_library_config") {
@@ skipping 41 matching lines @@
   }
 
   if (is_android) {
     defines += [
       # Android devices are typically more memory constrained, so default to a
       # smaller glyph cache (it may be overriden at runtime when the renderer
       # starts up, depending on the actual device memory).
       "SK_DEFAULT_FONT_CACHE_LIMIT=1048576"  # 1024 * 1024
     ]
   } else {
-    defines += "SK_DEFAULT_FONT_CACHE_LIMIT=20971520"  # 20 * 1024 * 1024
+    defines += [ "SK_DEFAULT_FONT_CACHE_LIMIT=20971520" ]  # 20 * 1024 * 1024
   }
 
   if (is_win) {
     include_dirs = [
       "//third_party/skia/include/utils/win",
       "//third_party/skia/src/utils/win",
     ]
 
-    defines += "SK_FONTHOST_USES_FONTMGR"
+    defines += [ "SK_FONTHOST_USES_FONTMGR" ]
 
     cflags = [
       # TODO(brettw) comment what these are.
       "/wd4244",
       "/wd4267",
       "/wd4341",
       "/wd4345",
       "/wd4390",
       "/wd4554",
       "/wd4748",
@@ skipping 913 matching lines @@
   static_library("skia_library") {
     external = true
     sources = skia_library_sources
 
     deps = [
       ":skia_opts",
       "//third_party/zlib",
     ]
 
     if (skia_support_pdf) {
-      deps += "//third_party/sfntly"
+      deps += [ "//third_party/sfntly" ]
     } else {
       # TODO(brettw) remove PDF sources.
     }
 
-    configs -= "//build/config/compiler:chromium_code"
+    configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [
       ":skia_config",
       ":skia_library_config",
       "//build/config/compiler:no_chromium_code"
     ]
 
     if (is_linux) {
       configs += [
         "//build/config/linux:fontconfig",
         "//build/config/linux:freetype2",
         "//build/config/linux:pangocairo",
       ]
       deps += [
         "//third_party/icu:icuuc",
       ]
     }
   }
 
   config("skia_chrome_config") {
     include_dirs = [ "ext" ]
   }
 
   static_library("skia_chrome") {
     external = true
     sources = skia_chrome_sources
 
-    configs -= "//build/config/compiler:chromium_code"
+    configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [
       ":skia_config",
       "//build/config/compiler:no_chromium_code",
     ]
     direct_dependent_configs = [ ":skia_chrome_config" ]
 
     deps = [
       ":skia_library",
       ":skia_chrome_opts",
       "//base",
@@ skipping 28 matching lines @@
     defines = [
       "SKIA_DLL",
     ]
   }
 
   shared_library("skia") {
     sources = skia_library_sources + skia_chrome_sources
 
     defines = [ "SKIA_IMPLEMENTATION=1", ]
 
-    configs -= "//build/config/compiler:chromium_code"
+    configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [
       ":skia_config",
       ":skia_library_config",
       "//build/config/compiler:no_chromium_code",
     ]
 
     direct_dependent_configs = [ ":skia_shared_library_config" ]
 
     deps = [
       ":skia_chrome_opts",
@@ skipping 27 matching lines @@
 } else {
   sse_cflags = []
 }
 
 
 static_library("skia_chrome_opts") {
   sources = [
     "ext/convolver_SSE2.cc",
   ]
 
-  configs -= "//build/config/compiler:chromium_code"
+  configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":skia_config",
     "//build/config/compiler:no_chromium_code"
   ]
 
   cflags = sse_cflags
 
   #'target_arch == "mipsel"',{
   #        'cflags': [
   #          '-fomit-frame-pointer',
   #        ],
   #        'sources': [
   #          'ext/convolver_mips_dspr2.cc',
   #        ],
   #      }],
 }
 
 static_library("skia_opts") {
   # TODO(brettw) ARM and MIPS.
   sources = [
     "//third_party/skia/src/opts/SkBitmapProcState_opts_SSE2.cpp",
     "//third_party/skia/src/opts/SkBlitRect_opts_SSE2.cpp",
     "//third_party/skia/src/opts/SkBlitRow_opts_SSE2.cpp",
     "//third_party/skia/src/opts/SkUtils_opts_SSE2.cpp",
     "//third_party/skia/src/opts/SkBitmapFilter_opts_SSE2.cpp",
   ]
 
-  configs -= "//build/config/compiler:chromium_code"
+  configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":skia_config",
     "//build/config/compiler:no_chromium_code"
   ]
 
   cflags = sse_cflags
 
   deps = [ ":skia_opts_ssse3" ]
 }
 
 static_library("skia_opts_ssse3") {
   # TODO(brettw) ARM and MIPS.
   sources = [
     "//third_party/skia/src/opts/SkBitmapProcState_opts_SSSE3.cpp",
   ]
 
-  configs -= "//build/config/compiler:chromium_code"
+  configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":skia_config",
     "//build/config/compiler:no_chromium_code"
   ]
 
   if (is_linux) {
     cflags = [ "-msse3" ]
   } else if (is_mac) {
     cflags = [ "-mssse3" ] # Note the third 's'.
   }
 }