clang/win: Stop disabling symbols by default in debug builds.

build/config/compiler/compiler.gni

Index: build/config/compiler/compiler.gni
diff --git a/build/config/compiler/compiler.gni b/build/config/compiler/compiler.gni
index 8a3552b68e5f11545af80542b1ffb561e1483f8b..2e5072e2589133090ed96f857b216186ee3a6836 100644
--- a/build/config/compiler/compiler.gni
+++ b/build/config/compiler/compiler.gni
@@ -82,10 +82,6 @@ if (symbol_level == -1) {
     # With instrumentation enabled, debug info puts libchrome.so over 4gb, which
     # causes the linker to produce an invalid ELF. http://crbug.com/574476
     symbol_level = 0
-  } else if (is_win && is_clang && !using_sanitizer) {
-    # TODO(thakis): Remove this again once building with clang/win and
-    # debug info doesn't make link.exe run for hours.
-    symbol_level = 1
   } else if (!is_linux || is_debug || is_official_build || is_chromecast) {
     # Linux is slowed by having symbols as part of the target binary, whereas
     # Mac and Windows have them separate, so in Release Linux, default them off,