Put pdf/out_of_process_instance.* into its own target.

OutOfProcessInstance requires PPAPI dependencies. So split it away from
the "internal" target, which is migrating away from PPAPI.

Bug: 1103478
Change-Id: Id17208b497b4f2e45c015fc702b82d1c16282771
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2293326
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789974}

pdf/BUILD.gn

@@ -48,6 +48,7 @@ if (enable_pdf) {
 
     deps = [
       ":internal",
+      ":out_of_process_instance",
       ":pdf",
       "//base",
       "//ppapi/cpp:objects",
@@ -87,8 +88,6 @@ if (enable_pdf) {
       "draw_utils/coordinates.h",
       "draw_utils/shadow.cc",
       "draw_utils/shadow.h",
-      "out_of_process_instance.cc",
-      "out_of_process_instance.h",
       "page_orientation.cc",
       "page_orientation.h",
       "paint_aggregator.cc",
@@ -185,6 +184,27 @@ if (enable_pdf) {
     ]
   }
 
+  source_set("out_of_process_instance") {
+    visibility = [ ":*" ]
+
+    sources = [
+      "out_of_process_instance.cc",
+      "out_of_process_instance.h",
+    ]
+
+    configs += [ ":pdf_common_config" ]
+
+    deps = [
+      ":features",
+      ":internal",
+      "//base",
+      "//net",
+      "//ppapi/cpp:objects",
+      "//ppapi/cpp/private:internal_module",
+      "//ui/base",
+    ]
+  }
+
   source_set("pdf_test_utils") {
     visibility = [ ":*" ]
 
@@ -246,6 +266,7 @@ if (enable_pdf) {
       ":assert_enums",
       ":features",
       ":internal",
+      ":out_of_process_instance",
       ":pdf",
       ":pdf_test_utils",
       "//base",