Add missing public_deps for //content/public/app:xxx GN targets.

content/public/app/BUILD.gn

Index: content/public/app/BUILD.gn
diff --git a/content/public/app/BUILD.gn b/content/public/app/BUILD.gn
index 0b5dec88d23251c0d00808beac644d02005dd037..0854ed23295cbd49a80c75f8f317339be23f40a8 100644
--- a/content/public/app/BUILD.gn
+++ b/content/public/app/BUILD.gn
@@ -59,17 +59,17 @@ if (is_component_build) {
 
   # These all just forward to content, which in turn depends on "both_sources".
   group("browser") {
-    deps = [
+    public_deps = [
       "//content",
     ]
   }
   group("child") {
-    deps = [
+    public_deps = [
       "//content",
     ]
   }
   group("both") {
-    deps = [
+    public_deps = [
       "//content",
     ]
   }