Move sanitizer and symbol flags out of BUILDCONFIG

[email protected] (chrome/installer/linux)
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1324623005

Cr-Commit-Position: refs/heads/master@{#348727}
diff --git a/chrome/installer/linux/BUILD.gn b/chrome/installer/linux/BUILD.gn
index 7520f209..ddd2321 100644
--- a/chrome/installer/linux/BUILD.gn
+++ b/chrome/installer/linux/BUILD.gn
@@ -4,6 +4,7 @@
 
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
+import("//build/config/sanitizers/sanitizers.gni")
 import("//build/util/version.gni")
 import("//chrome/version.gni")