Modified the pepper file chooser API to support filtering files by extensions.

ppapi/proxy/ppb_file_chooser_proxy.cc

Index: ppapi/proxy/ppb_file_chooser_proxy.cc
diff --git a/ppapi/proxy/ppb_file_chooser_proxy.cc b/ppapi/proxy/ppb_file_chooser_proxy.cc
index 466d0e698126ca991bda8add0c6ee5a38b228577..c7d7a74aa7aa0ce454b07b6268fcf643d6bab121 100644
--- a/ppapi/proxy/ppb_file_chooser_proxy.cc
+++ b/ppapi/proxy/ppb_file_chooser_proxy.cc
@@ -204,7 +204,7 @@ PPB_FileChooser_Proxy::~PPB_FileChooser_Proxy() {
 PP_Resource PPB_FileChooser_Proxy::CreateProxyResource(
     PP_Instance instance,
     PP_FileChooserMode_Dev mode,
-    const char* accept_mime_types) {
+    const char* accept_types) {
   Dispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
   if (!dispatcher)
     return 0;
@@ -213,7 +213,7 @@ PP_Resource PPB_FileChooser_Proxy::CreateProxyResource(
   dispatcher->Send(new PpapiHostMsg_PPBFileChooser_Create(
       API_ID_PPB_FILE_CHOOSER, instance,
       mode,
-      accept_mime_types ? accept_mime_types : "",
+      accept_types ? accept_types : "",
       &result));
 
   if (result.is_null())
@@ -239,14 +239,14 @@ bool PPB_FileChooser_Proxy::OnMessageReceived(const IPC::Message& msg) {
 void PPB_FileChooser_Proxy::OnMsgCreate(
     PP_Instance instance,
     int mode,
-    std::string accept_mime_types,
+    std::string accept_types,
     HostResource* result) {
   thunk::EnterResourceCreation enter(instance);
   if (enter.succeeded()) {
     result->SetHostResource(instance, enter.functions()->CreateFileChooser(
         instance,
         static_cast<PP_FileChooserMode_Dev>(mode),
-        accept_mime_types.c_str()));
+        accept_types.c_str()));
   }
 }