Fixes for re-enabling more MSVC level 4 warnings: pdf/ edition

pdf/out_of_process_instance.h

Index: pdf/out_of_process_instance.h
diff --git a/pdf/out_of_process_instance.h b/pdf/out_of_process_instance.h
index f1f88621b46f58469732ba40f4fd3f52d2364d61..c001435e0a4b6df12f6a1609314ab98f80a4559f 100644
--- a/pdf/out_of_process_instance.h
+++ b/pdf/out_of_process_instance.h
@@ -159,7 +159,7 @@ class OutOfProcessInstance : public pp::Instance,
   int GetDocumentPixelHeight() const;
 
   // Draws a rectangle with the specified dimensions and color in our buffer.
-  void FillRect(const pp::Rect& rect, unsigned int color);
+  void FillRect(const pp::Rect& rect, uint32 color);
 
   void LoadUrl(const std::string& url);
   void LoadPreviewUrl(const std::string& url);
@@ -240,7 +240,7 @@ class OutOfProcessInstance : public pp::Instance,
 
   struct BackgroundPart {
     pp::Rect location;
-    unsigned int color;
+    uint32 color;
   };
   std::vector<BackgroundPart> background_parts_;