pdf: Move PepperPDFHost into the pdf component.

components/pdf/renderer/ppb_pdf_impl.h

Index: components/pdf/renderer/ppb_pdf_impl.h
diff --git a/components/pdf/renderer/ppb_pdf_impl.h b/components/pdf/renderer/ppb_pdf_impl.h
index 55eda541b326dc8cc57aeb5ebcaacdee31e33255..086ecc0f3f94f168fbc476689712fbe572a44c9b 100644
--- a/components/pdf/renderer/ppb_pdf_impl.h
+++ b/components/pdf/renderer/ppb_pdf_impl.h
@@ -19,7 +19,7 @@ class PPB_PDF_Impl {
 
     virtual bool IsPrintingEnabled(PP_Instance instance_id) = 0;
 
-    virtual void Print(PP_Instance instance_id) = 0;
+    virtual bool Print(PP_Instance instance_id) = 0;
   };
 
   // Returns a pointer to the interface implementing PPB_PDF that is exposed
@@ -27,8 +27,9 @@ class PPB_PDF_Impl {
   static const PPB_PDF* GetInterface();
 
   // Invokes the "Print" command for the given instance as if the user right
-  // clicked on it and selected "Print".
-  static void InvokePrintingForInstance(PP_Instance instance);
+  // clicked on it and selected "Print". Returns if the "Print" command was
+  // issued or not.
+  static bool InvokePrintingForInstance(PP_Instance instance);
 
   static void SetPrintDelegate(PrintDelegate* print_delegate);
 };