Gtk3: Fix crash when using Gtk3.20

chrome/browser/ui/libgtkui/BUILD.gn

Index: chrome/browser/ui/libgtkui/BUILD.gn
diff --git a/chrome/browser/ui/libgtkui/BUILD.gn b/chrome/browser/ui/libgtkui/BUILD.gn
index 837861558c49e8f0e93aca2ea5d6114413375824..b7418020e3a9be0985eed4db4da18d424875566b 100644
--- a/chrome/browser/ui/libgtkui/BUILD.gn
+++ b/chrome/browser/ui/libgtkui/BUILD.gn
@@ -126,6 +126,8 @@ group("libgtkui") {
   }
 }
 
+# TODO(thomasanderson): libgtk2ui and libgtk3ui share much of the same code.
+# Extract the common code into a template.
 component("libgtk2ui") {
   sources = common_sources + [
               "native_theme_gtk2.cc",
@@ -160,6 +162,13 @@ component("libgtk3ui") {
   configs += common_configs
   defines = [ "LIBGTKUI_IMPLEMENTATION" ]
 
+  # GTK3 pulls pangoft2 as dependency, and pangoft2 depends on harfbuzz.
+  # To avoid missing indirectly referenced harfbuzz symbols from pango,
+  # some hack is required when bundled harfbuzz is used and component build is
+  # disabled.
+  # See crbug.com/462689 for details.
+  all_dependent_configs = [ "//third_party/harfbuzz-ng:pangoft2_link_hack" ]
+
   deps = common_deps + [
            "//build/config/linux/gtk3",
            "//build/config/linux/gtk3:gtkprint3",