Cleanup misc nits in the PDF plugin.

pdf/pdfium/pdfium_engine.cc

Index: pdf/pdfium/pdfium_engine.cc
diff --git a/pdf/pdfium/pdfium_engine.cc b/pdf/pdfium/pdfium_engine.cc
index 53f9746063fad9729697cac90038f1846f90dfde..13c16c9159dd363d31a37b3c80141bc4765703cb 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -156,14 +156,14 @@ void* MapFont(struct _FPDF_SYSFONTINFO*, int weight, int italic,
   // printing).
   // TODO(noamsml): Real font substitution (http://crbug.com/391978)
   if (!pp::Module::Get())
-    return NULL;
+    return nullptr;
 
   pp::BrowserFontDescription description;
 
   // Pretend the system does not have the Symbol font to force a fallback to
   // the built in Symbol font in CFX_FontMapper::FindSubstFont().
   if (strcmp(face, "Symbol") == 0)
-    return NULL;
+    return nullptr;
 
   if (pitch_family & FXFONT_FF_FIXEDPITCH) {
     description.set_family(PP_BROWSERFONT_TRUSTED_FAMILY_MONOSPACE);
@@ -254,7 +254,7 @@ void* MapFont(struct _FPDF_SYSFONTINFO*, int weight, int italic,
 
   if (!pp::PDF::IsAvailable()) {
     NOTREACHED();
-    return NULL;
+    return nullptr;
   }
 
   PP_Resource font_resource = pp::PDF::GetFontFileWithFallback(
@@ -406,7 +406,7 @@ void FormatStringForOS(base::string16* text) {
 
 // Returns a VarDictionary (representing a bookmark), which in turn contains
 // child VarDictionaries (representing the child bookmarks).
-// If NULL is passed in as the bookmark then we traverse from the "root".
+// If nullptr is passed in as the bookmark then we traverse from the "root".
 // Note that the "root" bookmark contains no useful information.
 pp::VarDictionary TraverseBookmarks(FPDF_DOCUMENT doc,
                                     FPDF_BOOKMARK bookmark,
@@ -532,8 +532,8 @@ PDFiumEngine::PDFiumEngine(PDFEngine::Client* client)
       current_rotation_(0),
       doc_loader_(this),
       password_tries_remaining_(0),
-      doc_(NULL),
-      form_(NULL),
+      doc_(nullptr),
+      form_(nullptr),
       defer_page_unload_(false),
       selecting_(false),
       mouse_down_state_(PDFiumPage::NONSELECTABLE_AREA,
@@ -543,7 +543,7 @@ PDFiumEngine::PDFiumEngine(PDFEngine::Client* client)
       last_character_index_to_search_(-1),
       permissions_(0),
       permissions_handler_revision_(-1),
-      fpdf_availability_(NULL),
+      fpdf_availability_(nullptr),
       next_timer_id_(0),
       last_page_mouse_down_(-1),
       most_visible_page_(-1),
@@ -572,7 +572,7 @@ PDFiumEngine::PDFiumEngine(PDFEngine::Client* client)
   // PDFiumEngine.
   FPDF_FORMFILLINFO::version = 1;
   FPDF_FORMFILLINFO::m_pJsPlatform = this;
-  FPDF_FORMFILLINFO::Release = NULL;
+  FPDF_FORMFILLINFO::Release = nullptr;
   FPDF_FORMFILLINFO::FFI_Invalidate = Form_Invalidate;
   FPDF_FORMFILLINFO::FFI_OutputSelectedRect = Form_OutputSelectedRect;
   FPDF_FORMFILLINFO::FFI_SetCursor = Form_SetCursor;
@@ -616,7 +616,7 @@ PDFiumEngine::PDFiumEngine(PDFEngine::Client* client)
   IPDF_JSPLATFORM::Field_browse = Form_Browse;
 
   IFSDK_PAUSE::version = 1;
-  IFSDK_PAUSE::user = NULL;
+  IFSDK_PAUSE::user = nullptr;
   IFSDK_PAUSE::NeedToPauseNow = Pause_NeedToPauseNow;
 
 #if defined(OS_LINUX)
@@ -1351,7 +1351,7 @@ pp::Buffer_Dev PDFiumEngine::PrintPagesAsRasterPDF(
     FPDF_CloseDocument(temp_doc);
 
     PDFiumMemBufferFileRead file_read(buffer.data(), buffer.size());
-    temp_doc = FPDF_LoadCustomDocument(&file_read, NULL);
+    temp_doc = FPDF_LoadCustomDocument(&file_read, nullptr);
 
     FPDF_BOOL imported = FPDF_ImportPages(output_doc, temp_doc, "1", i);
     FPDF_CloseDocument(temp_doc);
@@ -2236,7 +2236,7 @@ int PDFiumEngine::GetNumberOfPages() {
 }
 
 pp::VarArray PDFiumEngine::GetBookmarks() {
-  pp::VarDictionary dict = TraverseBookmarks(doc_, NULL, 0);
+  pp::VarDictionary dict = TraverseBookmarks(doc_, nullptr, 0);
   // The root bookmark contains no useful information.
   return pp::VarArray(dict.Get(pp::Var("children")));
 }
@@ -2626,7 +2626,8 @@ bool PDFiumEngine::CheckPageAvailable(int index, std::vector<int>* pending) {
   if (!doc_ || !form_)
     return false;
 
-  if (static_cast<int>(pages_.size()) > index && pages_[index]->available())
+  const int num_pages = static_cast<int>(pages_.size());
+  if (index < num_pages && pages_[index]->available())
     return true;
 
   if (!FPDFAvail_IsPageAvail(fpdf_availability_, index, &download_hints_)) {
@@ -2641,7 +2642,7 @@ bool PDFiumEngine::CheckPageAvailable(int index, std::vector<int>* pending) {
     return false;
   }
 
-  if (static_cast<int>(pages_.size()) > index)
+  if (index < num_pages)
     pages_[index]->set_available(true);
   if (!default_page_size_.GetArea())
     default_page_size_ = GetPageSize(index);
@@ -2674,7 +2675,7 @@ int PDFiumEngine::StartPaint(int page_index, const pp::Rect& dirty) {
   ProgressivePaint progressive;
   progressive.rect = dirty;
   progressive.page_index = page_index;
-  progressive.bitmap = NULL;
+  progressive.bitmap = nullptr;
   progressive.painted_ = false;
   progressive_paints_.push_back(progressive);
   return progressive_paints_.size() - 1;
@@ -2840,7 +2841,7 @@ void PDFiumEngine::DrawSelections(int progressive_index,
   int page_index = progressive_paints_[progressive_index].page_index;
   pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
 
-  void* region = NULL;
+  void* region = nullptr;
   int stride;
   GetRegion(dirty_in_screen.point(), image_data, &region, &stride);
 
@@ -2905,7 +2906,7 @@ FPDF_BITMAP PDFiumEngine::CreateBitmap(const pp::Rect& rect,
   int stride;
   GetRegion(rect.point(), image_data, &region, &stride);
   if (!region)
-    return NULL;
+    return nullptr;
   return FPDFBitmap_CreateEx(
       rect.width(), rect.height(), FPDFBitmap_BGRx, region, stride);
 }
@@ -3284,7 +3285,7 @@ void PDFiumEngine::GetRegion(const pp::Point& location,
   if (image_data->is_null()) {
     DCHECK(plugin_size_.IsEmpty());
     *stride = 0;
-    *region = NULL;
+    *region = nullptr;
     return;
   }
   char* buffer = static_cast<char*>(image_data->data());
@@ -3294,7 +3295,7 @@ void PDFiumEngine::GetRegion(const pp::Point& location,
   // TODO: update this when we support BIDI and scrollbars can be on the left.
   if (!buffer ||
       !pp::Rect(page_offset_, plugin_size_).Contains(offset_location)) {
-    *region = NULL;
+    *region = nullptr;
     return;
   }
 
@@ -3416,7 +3417,7 @@ FPDF_PAGE PDFiumEngine::Form_GetPage(FPDF_FORMFILLINFO* param,
                                      int page_index) {
   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
   if (page_index < 0 || page_index >= static_cast<int>(engine->pages_.size()))
-    return NULL;
+    return nullptr;
   return engine->pages_[page_index]->GetPage();
 }
 
@@ -3429,7 +3430,7 @@ FPDF_PAGE PDFiumEngine::Form_GetCurrentPage(FPDF_FORMFILLINFO* param,
     index = engine->GetMostVisiblePage();
     if (index == -1) {
       NOTREACHED();
-      return NULL;
+      return nullptr;
     }
   }
 
@@ -3733,7 +3734,7 @@ bool PDFiumEngineExports::RenderPDFPageToDC(const void* pdf_buffer,
                                             int page_number,
                                             const RenderingSettings& settings,
                                             HDC dc) {
-  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, NULL);
+  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, nullptr);
   if (!doc)
     return false;
   FPDF_PAGE page = FPDF_LoadPage(doc, page_number);
@@ -3805,7 +3806,8 @@ bool PDFiumEngineExports::RenderPDFPageToBitmap(
     int page_number,
     const RenderingSettings& settings,
     void* bitmap_buffer) {
-  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, NULL);
+  FPDF_DOCUMENT doc =
+      FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, nullptr);
   if (!doc)
     return false;
   FPDF_PAGE page = FPDF_LoadPage(doc, page_number);
@@ -3839,7 +3841,7 @@ bool PDFiumEngineExports::GetPDFDocInfo(const void* pdf_buffer,
                                         int buffer_size,
                                         int* page_count,
                                         double* max_page_width) {
-  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, NULL);
+  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, nullptr);
   if (!doc)
     return false;
   int page_count_local = FPDF_GetPageCount(doc);
@@ -3867,7 +3869,8 @@ bool PDFiumEngineExports::GetPDFPageSizeByIndex(
     int page_number,
     double* width,
     double* height) {
-  FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, NULL);
+  FPDF_DOCUMENT doc =
+      FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, nullptr);
   if (!doc)
     return false;
   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;