Prevent double deletion in PrintRenderFrameHelper.

Bug: 1134960
Change-Id: I765cc3f1463fce4b8d7c2ca99f429031566a4645
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454732Reviewed-by: Jesse Schettler <jschettler@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814756}

components/printing/renderer/print_render_frame_helper.cc

@@ -2071,8 +2071,10 @@ void PrintRenderFrameHelper::IPCReceived() {
 
 void PrintRenderFrameHelper::IPCProcessed() {
   --ipc_nesting_level_;
-  if (ipc_nesting_level_ == 0 && render_frame_gone_)
+  if (ipc_nesting_level_ == 0 && render_frame_gone_ && !delete_pending_) {
+    delete_pending_ = true;
     base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
+  }
 }
 
 bool PrintRenderFrameHelper::InitPrintSettings(bool fit_to_paper_size) {

components/printing/renderer/print_render_frame_helper.h

@@ -637,6 +637,7 @@ class PrintRenderFrameHelper
   bool is_scripted_preview_delayed_ = false;
   int ipc_nesting_level_ = 0;
   bool render_frame_gone_ = false;
+  bool delete_pending_ = false;
 
   // If tagged PDF exporting is enabled, we also need to capture an
   // accessibility tree and store it in the metafile. AXTreeSnapshotter should