Sort "deps" and "public_deps" when running the "gn format" command.

tools/gn/format_test_data/063.golden

Index: tools/gn/format_test_data/063.golden
diff --git a/tools/gn/format_test_data/063.golden b/tools/gn/format_test_data/063.golden
new file mode 100644
index 0000000000000000000000000000000000000000..7060a0251b889b506b90afe72248b1e9f544a5cc
--- /dev/null
+++ b/tools/gn/format_test_data/063.golden
@@ -0,0 +1,15 @@
+source_set("test") {
+  deps = [
+    "//a",
+    "//c",
+    ":b",

[Dirk Pranke, 2015/11/13 17:31:31]

relative targets like ":b" and "../b" should be listed before
absolute targets, even if that's not how sort() would sort them.

+  ]
+
+  if (condition) {
+    deps += [
+      "//x",
+      "//y",
+      "//z",
+    ]
+  }
+}