Remove a bunch of TOOLKIT_GTK in content/ and gpu/, as well as NPAPI plugins on linux

content/child/npapi/plugin_host.cc

Index: content/child/npapi/plugin_host.cc
diff --git a/content/child/npapi/plugin_host.cc b/content/child/npapi/plugin_host.cc
index 39c62573faaf8b217087a3eba9148f4c8d01de66..6a9a0d1e1c21c407fdd44b0ad29f1c700d0cc087 100644
--- a/content/child/npapi/plugin_host.cc
+++ b/content/child/npapi/plugin_host.cc
@@ -742,18 +742,6 @@ NPError NPN_GetValue(NPP id, NPNVariable variable, void* value) {
       rv = NPERR_NO_ERROR;
       break;
     }
-  #if defined(TOOLKIT_GTK)
-    case NPNVToolkit:
-      // Tell them we are GTK2.  (The alternative is GTK 1.2.)
-      *reinterpret_cast<int*>(value) = NPNVGtk2;
-      rv = NPERR_NO_ERROR;
-      break;
-
-    case NPNVSupportsXEmbedBool:
-      *reinterpret_cast<NPBool*>(value) = true;
-      rv = NPERR_NO_ERROR;
-      break;
-  #endif
     case NPNVSupportsWindowless: {
       NPBool* supports_windowless = reinterpret_cast<NPBool*>(value);
       *supports_windowless = true;