Move libc++ configs and flags out of //build/config/sanitizers

extensions/shell/installer/linux/BUILD.gn

Index: extensions/shell/installer/linux/BUILD.gn
diff --git a/extensions/shell/installer/linux/BUILD.gn b/extensions/shell/installer/linux/BUILD.gn
index 87d9c9081b6746c22a6dcce6ef6f918438f6b5b7..d537e7130ecac8126252abafe38ff615000dc3c3 100644
--- a/extensions/shell/installer/linux/BUILD.gn
+++ b/extensions/shell/installer/linux/BUILD.gn
@@ -4,6 +4,7 @@
 
 # TODO(michaelpg): Dedupe with Chrome installer.
 
+import("//build/config/c++/c++.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
@@ -127,9 +128,6 @@ group("installer_deps") {
       "//ppapi/native_client:irt",
     ]
   }
-  if (use_custom_libcxx) {
-    public_deps += [ "//buildtools/third_party/libc++" ]
-  }
 }
 
 # Creates .deb installer package.
@@ -156,7 +154,11 @@ template("linux_package") {
     ]
   }
 
-  if (use_custom_libcxx) {
+  # TODO(thomasanderson): Move this variable into a .gni file
+  # somewhere.  It is currently copied from
+  # buildtools/third_party/libc++/BUILD.gn.
+  libcpp_is_static = !is_component_build && !using_sanitizer
+  if (!libcpp_is_static && use_custom_libcxx) {
     packaging_files_binaries += [ "$root_out_dir/libc++.so" ]
   }