GN: Make content_shell and webkit_unit_tests work in component build

content/public/browser/BUILD.gn

Index: content/public/browser/BUILD.gn
diff --git a/content/public/browser/BUILD.gn b/content/public/browser/BUILD.gn
index 05cb6f190961d57c6734773f2c2f09b43db5ad4c..378eed5dfe59f60f581ec66350e7b2495c687e78 100644
--- a/content/public/browser/BUILD.gn
+++ b/content/public/browser/BUILD.gn
@@ -5,7 +5,18 @@
 import("//content/browser/browser.gni")
 import("//build/config/ui.gni")
 
-source_set("browser") {
+group("browser") {

[jamesr, 2014/08/12 04:03:08]

without this patch various components were depending on //content/public/browser
in the component build and linking in pieces of content into themselves, which
doesn't work very well.

//content/public/{common,renderer,etc} have the same issue at least in theory
but converting them all over to this without introducing cycles through
//content or adding conditionals to a really crazy number of things conditional
on is_component_build. for now this is the only target producing failing links
so it's all i've done for now

+  if (is_component_build) {
+    deps = [ "//content" ]
+  } else {
+    deps = [ ":sources" ]
+  }
+  forward_dependent_configs_from = deps
+}
+
+source_set("sources") {
+  visibility = [ "//content", ":browser" ]
+
   if (is_ios) {
     # iOS doesn't get the normal file list and only takes these whitelisted
     # files.