Revert of Shrink gn's chrome.dll - now smaller than gyp's

content/gpu/BUILD.gn

Index: content/gpu/BUILD.gn
diff --git a/content/gpu/BUILD.gn b/content/gpu/BUILD.gn
index 597b4cd51788e6ec23eb6cc1288447236d82ccf0..5b0f6b69df84c355be8fce0e1c475b779c8b466f 100644
--- a/content/gpu/BUILD.gn
+++ b/content/gpu/BUILD.gn
@@ -20,12 +20,7 @@
   }
 }
 
-if (is_component_build) {
-  link_target_type = "source_set"
-} else {
-  link_target_type = "static_library"
-}
-target(link_target_type, "gpu_sources") {
+source_set("gpu_sources") {
   # This is an internal content API. Code outside of the content "component"
   # (like content/test and content/shell) should depend on ":gpu" above.
   visibility = [ "//content/*" ]