Rearrange targets in pdf/BUILD.gn.

Move some public facing targets above the internal ones.

Change-Id: I15d42453a9b01dcb13ffd419ebcc37f8b477eefe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300995
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789757}

pdf/BUILD.gn

@@ -35,6 +35,36 @@ if (enable_pdf) {
     ]
   }
 
+  component("pdf_ppapi") {
+    sources = [ "pdf_ppapi.cc" ]
+
+    configs += [ ":pdf_common_config" ]
+
+    defines = [ "IS_PDF_PPAPI_IMPL" ]
+
+    public = [ "pdf_ppapi.h" ]
+
+    deps = [
+      ":internal",
+      ":pdf",
+      "//base",
+      "//ppapi/cpp:objects",
+      "//ppapi/cpp/private:internal_module",
+      "//skia",
+      "//v8",
+    ]
+  }
+
+  source_set("features") {
+    sources = [ "pdf_features.cc" ]
+
+    configs += [ ":pdf_common_config" ]
+
+    public = [ "pdf_features.h" ]
+
+    deps = [ "//base" ]
+  }
+
   source_set("internal") {
     visibility = [ ":*" ]
 
@@ -153,36 +183,6 @@ if (enable_pdf) {
     ]
   }
 
-  component("pdf_ppapi") {
-    sources = [ "pdf_ppapi.cc" ]
-
-    configs += [ ":pdf_common_config" ]
-
-    defines = [ "IS_PDF_PPAPI_IMPL" ]
-
-    public = [ "pdf_ppapi.h" ]
-
-    deps = [
-      ":internal",
-      ":pdf",
-      "//base",
-      "//ppapi/cpp:objects",
-      "//ppapi/cpp/private:internal_module",
-      "//skia",
-      "//v8",
-    ]
-  }
-
-  source_set("features") {
-    sources = [ "pdf_features.cc" ]
-
-    configs += [ ":pdf_common_config" ]
-
-    public = [ "pdf_features.h" ]
-
-    deps = [ "//base" ]
-  }
-
   source_set("pdf_test_utils") {
     visibility = [ ":*" ]