Remove duplicated includes in PdfPrinterHandler

While working in PdfPrinterHandler noticed some duplicated includes,
this cl just gets rid of those.

Bug: None
Test: Build
Change-Id: Ie19635ff093bfa135bdeb36b45acf69f5ed18d5f
Reviewed-on: https://chromium-review.googlesource.com/1102104Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: David Jacobo <djacobo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567719}

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

@@ -4,16 +4,13 @@
 
 #include "chrome/browser/ui/webui/print_preview/pdf_printer_handler.h"
 
-#include <memory>
-#include <string>
 #include <utility>
 
 #include "base/callback.h"
 #include "base/command_line.h"
+#include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/i18n/file_util_icu.h"
-#include "base/memory/ref_counted.h"
-#include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_scheduler/post_task.h"
@@ -39,6 +36,7 @@
 #include "printing/units.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/geometry/size.h"
+#include "url/gurl.h"
 
 namespace {
 

chrome/browser/ui/webui/print_preview/pdf_printer_handler.h

@@ -8,8 +8,6 @@
 #include <memory>
 #include <string>
 
-#include "base/callback.h"
-#include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
@@ -17,6 +15,7 @@
 #include "ui/shell_dialogs/select_file_dialog.h"
 
 namespace base {
+class FilePath;
 class RefCountedMemory;
 }