Prefix Did{Start|Stop}Loading methods.

components/pdf/renderer/pepper_pdf_host.cc

Index: components/pdf/renderer/pepper_pdf_host.cc
diff --git a/components/pdf/renderer/pepper_pdf_host.cc b/components/pdf/renderer/pepper_pdf_host.cc
index c56d78e97ca11dac681911a558d2a9168da609ae..af5469363a0f1487833bbabc8790333decf1ef1a 100644
--- a/components/pdf/renderer/pepper_pdf_host.cc
+++ b/components/pdf/renderer/pepper_pdf_host.cc
@@ -101,7 +101,7 @@ int32_t PepperPDFHost::OnHostMsgDidStartLoading(
   if (!render_frame)
     return PP_ERROR_FAILED;
 
-  render_frame->DidStartLoading();
+  render_frame->PluginDidStartLoading();
   return PP_OK;
 }
 
@@ -111,7 +111,7 @@ int32_t PepperPDFHost::OnHostMsgDidStopLoading(
   if (!render_frame)
     return PP_ERROR_FAILED;
 
-  render_frame->DidStopLoading();
+  render_frame->PluginDidStopLoading();
   return PP_OK;
 }