Run clang-tidy modernize-use-equals-{delete,default} on //printing

See the bugs and cxx post for justification and details:
https://groups.google.com/a/chromium.org/forum/#!topic/cxx/RkOHzIK6Tq8

This change was done using clang-tidy as described here:
https://chromium.googlesource.com/chromium/src/+/lkcr/docs/clang_tidy.md

In some cases the the tool leaves behind a string of commas where it
replaced a member initializer list
(https://bugs.llvm.org/show_bug.cgi?id=35051). They were cleaned up with:
  git diff --name-only | \
    xargs sed -E -i 's/(^\s*|\)\s*):[ ,]*= default/\1 = default/'

BUG=778959,778957

Change-Id: Id32fe134ba35b64c9593c46297620e84e508d1ce
Reviewed-on: https://chromium-review.googlesource.com/789727Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Chris Watkins <watk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520864}

printing/backend/print_backend.cc

@@ -19,7 +19,7 @@ PrinterBasicInfo::PrinterBasicInfo()
 
 PrinterBasicInfo::PrinterBasicInfo(const PrinterBasicInfo& other) = default;
 
-PrinterBasicInfo::~PrinterBasicInfo() {}
+PrinterBasicInfo::~PrinterBasicInfo() = default;
 
 PrinterSemanticCapsAndDefaults::PrinterSemanticCapsAndDefaults()
     : collate_capable(false),
@@ -36,16 +36,16 @@ PrinterSemanticCapsAndDefaults::PrinterSemanticCapsAndDefaults()
 PrinterSemanticCapsAndDefaults::PrinterSemanticCapsAndDefaults(
     const PrinterSemanticCapsAndDefaults& other) = default;
 
-PrinterSemanticCapsAndDefaults::~PrinterSemanticCapsAndDefaults() {}
+PrinterSemanticCapsAndDefaults::~PrinterSemanticCapsAndDefaults() = default;
 
-PrinterCapsAndDefaults::PrinterCapsAndDefaults() {}
+PrinterCapsAndDefaults::PrinterCapsAndDefaults() = default;
 
 PrinterCapsAndDefaults::PrinterCapsAndDefaults(
     const PrinterCapsAndDefaults& other) = default;
 
-PrinterCapsAndDefaults::~PrinterCapsAndDefaults() {}
+PrinterCapsAndDefaults::~PrinterCapsAndDefaults() = default;
 
-PrintBackend::~PrintBackend() {}
+PrintBackend::~PrintBackend() = default;
 
 // static
 scoped_refptr<PrintBackend> PrintBackend::CreateInstance(

printing/backend/print_backend_chromeos.cc

@@ -60,10 +60,10 @@ class PrintBackendChromeOS : public PrintBackend {
   bool IsValidPrinter(const std::string& printer_name) override;
 
  protected:
-  ~PrintBackendChromeOS() override {}
+  ~PrintBackendChromeOS() override = default;
 };
 
-PrintBackendChromeOS::PrintBackendChromeOS() {}
+PrintBackendChromeOS::PrintBackendChromeOS() = default;
 
 bool PrintBackendChromeOS::EnumeratePrinters(PrinterList* printer_list) {
   return true;

printing/backend/test_print_backend.cc

@@ -12,9 +12,9 @@
 
 namespace printing {
 
-TestPrintBackend::TestPrintBackend() {}
+TestPrintBackend::TestPrintBackend() = default;
 
-TestPrintBackend::~TestPrintBackend() {}
+TestPrintBackend::~TestPrintBackend() = default;
 
 bool TestPrintBackend::EnumeratePrinters(PrinterList* printer_list) {
   if (printer_list_.empty())

printing/image.cc

@@ -24,14 +24,9 @@ Image::Image(const Metafile& metafile)
   LoadMetafile(metafile);
 }
 
-Image::Image(const Image& image)
-    : size_(image.size_),
-      row_length_(image.row_length_),
-      data_(image.data_),
-      ignore_alpha_(image.ignore_alpha_) {
-}
+Image::Image(const Image& image) = default;
 
-Image::~Image() {}
+Image::~Image() = default;
 
 std::string Image::checksum() const {
   base::MD5Digest digest;

printing/metafile.cc

@@ -13,17 +13,13 @@
 
 namespace printing {
 
-MetafilePlayer::MetafilePlayer() {
-}
+MetafilePlayer::MetafilePlayer() = default;
 
-MetafilePlayer::~MetafilePlayer() {
-}
+MetafilePlayer::~MetafilePlayer() = default;
 
-Metafile::Metafile() {
-}
+Metafile::Metafile() = default;
 
-Metafile::~Metafile() {
-}
+Metafile::~Metafile() = default;
 
 bool Metafile::GetDataAsVector(std::vector<char>* buffer) const {
   buffer->resize(GetDataSize());

printing/page_setup.cc

@@ -43,7 +43,7 @@ PageSetup::PageSetup() {
 
 PageSetup::PageSetup(const PageSetup& other) = default;
 
-PageSetup::~PageSetup() {}
+PageSetup::~PageSetup() = default;
 
 void PageSetup::Clear() {
   physical_size_.SetSize(0, 0);

printing/pdf_metafile_skia.cc

@@ -80,7 +80,7 @@ struct PdfMetafileSkiaData {
 #endif
 };
 
-PdfMetafileSkia::~PdfMetafileSkia() {}
+PdfMetafileSkia::~PdfMetafileSkia() = default;
 
 bool PdfMetafileSkia::Init() {
   return true;

printing/print_settings.cc

@@ -154,8 +154,7 @@ PrintSettings::PrintSettings() {
 
 PrintSettings::PrintSettings(const PrintSettings& other) = default;
 
-PrintSettings::~PrintSettings() {
-}
+PrintSettings::~PrintSettings() = default;
 
 void PrintSettings::Clear() {
   ranges_.clear();

printing/printed_document.cc

@@ -111,8 +111,7 @@ PrintedDocument::PrintedDocument(const PrintSettings& settings,
     DebugDumpSettings(name, settings);
 }
 
-PrintedDocument::~PrintedDocument() {
-}
+PrintedDocument::~PrintedDocument() = default;
 
 void PrintedDocument::SetPage(int page_number,
                               std::unique_ptr<MetafilePlayer> metafile,
@@ -239,16 +238,16 @@ void PrintedDocument::DebugDumpData(
                                           base::RetainedRef(data)));
 }
 
-PrintedDocument::Mutable::Mutable() {}
+PrintedDocument::Mutable::Mutable() = default;
 
-PrintedDocument::Mutable::~Mutable() {}
+PrintedDocument::Mutable::~Mutable() = default;
 
 PrintedDocument::Immutable::Immutable(const PrintSettings& settings,
                                       const base::string16& name,
                                       int cookie)
     : settings_(settings), name_(name), cookie_(cookie) {}
 
-PrintedDocument::Immutable::~Immutable() {}
+PrintedDocument::Immutable::~Immutable() = default;
 
 #if defined(OS_ANDROID)
 // This function is not used on android.

printing/printed_page.cc

@@ -21,8 +21,7 @@ PrintedPage::PrintedPage(int page_number,
       page_content_rect_(page_content_rect) {
 }
 
-PrintedPage::~PrintedPage() {
-}
+PrintedPage::~PrintedPage() = default;
 
 const MetafilePlayer* PrintedPage::metafile() const {
   return metafile_.get();

printing/printing_context.cc

@@ -26,8 +26,7 @@ PrintingContext::PrintingContext(Delegate* delegate)
   DCHECK(delegate_);
 }
 
-PrintingContext::~PrintingContext() {
-}
+PrintingContext::~PrintingContext() = default;
 
 void PrintingContext::set_margin_type(MarginType type) {
   DCHECK(type != CUSTOM_MARGINS);