chrome: Move chrome/browser/printing out of chrome namespace.

From discussion on chromium-dev, it was decided to remove 'chrome'
namespace.

Bug: 289619
Change-Id: I520f6d601ea913f96b13ec95fef1054d96f866d9
Reviewed-on: https://chromium-review.googlesource.com/771379Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: srirama chandra sekhar <srirama.m@samsung.com>
Cr-Commit-Position: refs/heads/master@{#517007}

chrome/browser/printing/print_error_dialog.cc

@@ -11,13 +11,11 @@
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/l10n/l10n_util.h"
 
-namespace chrome {
-
 namespace {
 
 void ShowPrintErrorDialogTask() {
   Browser* browser = chrome::FindLastActive();
-  ShowWarningMessageBox(
+  chrome::ShowWarningMessageBox(
       browser ? browser->window()->GetNativeWindow() : NULL,
       l10n_util::GetStringUTF16(IDS_PRINT_SPOOL_FAILED_TITLE_TEXT),
       l10n_util::GetStringUTF16(IDS_PRINT_SPOOL_FAILED_ERROR_TEXT));
@@ -30,5 +28,3 @@ void ShowPrintErrorDialog() {
   content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
                                    base::BindOnce(&ShowPrintErrorDialogTask));
 }
-
-}  // namespace chrome

chrome/browser/printing/print_error_dialog.h

@@ -5,12 +5,8 @@
 #ifndef CHROME_BROWSER_PRINTING_PRINT_ERROR_DIALOG_H_
 #define CHROME_BROWSER_PRINTING_PRINT_ERROR_DIALOG_H_
 
-namespace chrome {
-
 // Shows a window-modal error that printing failed for some unknown reason.
 // TODO(vitalybuka, crbug.com/351550): Should be replaced with better UI.
 void ShowPrintErrorDialog();
 
-}  // namespace chrome
-
 #endif  // CHROME_BROWSER_PRINTING_PRINT_ERROR_DIALOG_H_

chrome/browser/printing/print_view_manager_base.cc

@@ -268,7 +268,7 @@ void PrintViewManagerBase::OnPrintingFailed(int cookie) {
   PrintManager::OnPrintingFailed(cookie);
 
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW)
-  chrome::ShowPrintErrorDialog();
+  ShowPrintErrorDialog();
 #endif
 
   ReleasePrinterQuery();

chrome/browser/ui/webui/print_preview/print_preview_handler.cc

@@ -817,7 +817,7 @@ void PrintPreviewHandler::HandleCancelPendingPrintRequest(
   WebContents* initiator = GetInitiator();
   if (initiator)
     ClearInitiatorDetails();
-  chrome::ShowPrintErrorDialog();
+  ShowPrintErrorDialog();
 }
 
 void PrintPreviewHandler::HandleSaveAppState(const base::ListValue* args) {