Move V8 snapshot loading code from isolate_holder to gin/v8_startup_data.{h,cc}.

components/pdf/renderer/ppb_pdf_impl.cc

Index: components/pdf/renderer/ppb_pdf_impl.cc
diff --git a/components/pdf/renderer/ppb_pdf_impl.cc b/components/pdf/renderer/ppb_pdf_impl.cc
index 6349543b717d6911c730e5c37b6249a5dc85bc48..3553c471b7e3267f430bde536e7196aefc9e33b8 100644
--- a/components/pdf/renderer/ppb_pdf_impl.cc
+++ b/components/pdf/renderer/ppb_pdf_impl.cc
@@ -18,7 +18,7 @@
 #include "content/public/renderer/pepper_plugin_instance.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
-#include "gin/public/isolate_holder.h"
+#include "gin/v8_initializer.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/private/ppb_pdf.h"
 #include "ppapi/c/trusted/ppb_browser_font_trusted.h"
@@ -343,8 +343,8 @@ void GetV8ExternalSnapshotData(PP_Instance instance_id,
                                int* natives_size_out,
                                const char** snapshot_data_out,
                                int* snapshot_size_out) {
-  gin::IsolateHolder::GetV8ExternalSnapshotData(natives_data_out,
-      natives_size_out, snapshot_data_out, snapshot_size_out);
+  gin::V8Initializer::GetV8ExternalSnapshotData(
+      natives_data_out, natives_size_out, snapshot_data_out, snapshot_size_out);
 }
 
 const PPB_PDF ppb_pdf = {                      //