Printing: Remove unused NEW_PAGE print job notification

All observers of print job notifications have this notification
commented with don't care, and don't do anything with it. Remove.

Bug: None
Change-Id: Ia669135a311ad1fc3090bb7de974c4a0718a4d0a
Reviewed-on: https://chromium-review.googlesource.com/802755Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521010}

chrome/browser/printing/print_job.cc

@@ -373,7 +373,6 @@ void PrintJob::OnNotifyPrintJobEvent(const JobEventDetails& event_details) {
       break;
     }
     case JobEventDetails::NEW_DOC:
-    case JobEventDetails::NEW_PAGE:
     case JobEventDetails::JOB_DONE:
     case JobEventDetails::ALL_PAGES_REQUESTED: {
       // Don't care.

chrome/browser/printing/print_job.h

@@ -186,9 +186,6 @@ class JobEventDetails : public base::RefCountedThreadSafe<JobEventDetails> {
     // A new document started printing.
     NEW_DOC,
 
-    // A new page started printing.
-    NEW_PAGE,
-
     // A page is done printing.
     PAGE_DONE,
 

chrome/browser/printing/print_job_manager.cc

@@ -138,7 +138,6 @@ void PrintJobManager::OnPrintJobEvent(
     case JobEventDetails::USER_INIT_DONE:
     case JobEventDetails::USER_INIT_CANCELED:
     case JobEventDetails::DEFAULT_INIT_DONE:
-    case JobEventDetails::NEW_PAGE:
     case JobEventDetails::PAGE_DONE:
     case JobEventDetails::DOC_DONE:
     case JobEventDetails::ALL_PAGES_REQUESTED: {

chrome/browser/printing/print_job_worker.cc

@@ -403,13 +403,6 @@ void PrintJobWorker::SpoolPage(PrintedPage* page) {
   DCHECK(task_runner_->RunsTasksInCurrentSequence());
   DCHECK_NE(page_number_, PageNumber::npos());
 
-  // Signal everyone that the page is about to be printed.
-  owner_->PostTask(
-      FROM_HERE,
-      base::Bind(&NotificationCallback, base::RetainedRef(owner_),
-                 JobEventDetails::NEW_PAGE, printing_context_->job_id(),
-                 base::RetainedRef(document_), base::RetainedRef(page)));
-
   // Preprocess.
   if (printing_context_->NewPage() != PrintingContext::OK) {
     OnFailure();

chrome/browser/printing/print_view_manager_base.cc

@@ -363,7 +363,6 @@ void PrintViewManagerBase::OnNotifyPrintJobEvent(
       break;
     }
     case JobEventDetails::NEW_DOC:
-    case JobEventDetails::NEW_PAGE:
     case JobEventDetails::PAGE_DONE:
     case JobEventDetails::DOC_DONE: {
       // Don't care about the actual printing process.

chrome/browser/printing/printing_layout_browsertest.cc

@@ -98,7 +98,6 @@ class PrintingLayoutTest : public PrintingTest<InProcessBrowserTest>,
       case printing::JobEventDetails::NEW_DOC:
       case printing::JobEventDetails::USER_INIT_DONE:
       case printing::JobEventDetails::DEFAULT_INIT_DONE:
-      case printing::JobEventDetails::NEW_PAGE:
       case printing::JobEventDetails::PAGE_DONE:
       case printing::JobEventDetails::DOC_DONE:
       case printing::JobEventDetails::ALL_PAGES_REQUESTED: {