Linux: Fix ATK assertion error when generating ARM build config.

patch/patch.cfg

@@ -524,5 +524,10 @@ patches = [
     # Windows/Linux: Fix scrolling in popup lists with high-dpi.
     # https://crrev.com/97514ca869
     'name': 'webkit_widget_base_2444320',
+  },
+  {
+    # Linux: Fix ATK assertion error when generating ARM build config.
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1123214
+    'name': 'linux_atk_1123214',
   }
 ]

patch/patches/linux_atk_1123214.patch

@@ -0,0 +1,13 @@
+diff --git build/config/linux/atk/BUILD.gn build/config/linux/atk/BUILD.gn
+index aad2efa60d6c..fe9f30b82c22 100644
+--- build/config/linux/atk/BUILD.gn
++++ build/config/linux/atk/BUILD.gn
+@@ -10,7 +10,7 @@ import("//build/config/ui.gni")
+ assert(!is_chromeos)
+ 
+ # These packages should _only_ be expected when building for a target.
+-assert(current_toolchain == default_toolchain)
++# assert(current_toolchain == default_toolchain)
+ 
+ if (use_atk) {
+   assert(use_glib, "use_atk=true requires that use_glib=true")