Enable -Werror for links in chromecast builds.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 66131c067aface76bafc756da5bcec17aef0498b..96d012d0e7d2717794341ca97d13265f249aa148 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -4,7 +4,6 @@
 
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
-import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/config/sanitizers/sanitizers.gni")
@@ -1069,8 +1068,7 @@ config("chromium_code") {
       # the actual linker.  Make sure these warnings are treated as errors as
       # well.
       # TODO(thakis): Enable in use_custom_libcxx builds, crbug.com/669072
-      # TODO(thakis): Enable in chromecast builds, crbug.com/669076
-      if (!use_custom_libcxx && !is_chromecast) {
+      if (!use_custom_libcxx) {
         ldflags = [ "-Werror" ]
       }
     }
@@ -1131,8 +1129,7 @@ config("no_chromium_code") {
       cflags += [ "-Werror" ]
 
       # TODO(thakis): Enable in use_custom_libcxx builds, crbug.com/669072
-      # TODO(thakis): Enable in chromecast builds, crbug.com/669076
-      if (!use_custom_libcxx && !is_chromecast) {
+      if (!use_custom_libcxx) {
         ldflags = [ "-Werror" ]
       }
     }