Change media galleries to external file system type to add toURL support

chrome/renderer/extensions/media_galleries_custom_bindings.cc

Index: chrome/renderer/extensions/media_galleries_custom_bindings.cc
diff --git a/chrome/renderer/extensions/media_galleries_custom_bindings.cc b/chrome/renderer/extensions/media_galleries_custom_bindings.cc
index 1b4a0e1c7fdb2df7cc8e60c95cd61d5348282fab..78a4e276571ab8aefa9b937c6578ff284ffba87c 100644
--- a/chrome/renderer/extensions/media_galleries_custom_bindings.cc
+++ b/chrome/renderer/extensions/media_galleries_custom_bindings.cc
@@ -23,21 +23,22 @@ void GetMediaFileSystemObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK_EQ(1, args.Length());
   CHECK(args[0]->IsString());
 
-  std::string fsid(*v8::String::Utf8Value(args[0]));
-  CHECK(!fsid.empty());
+  std::string fs_mount(*v8::String::Utf8Value(args[0]));
+  CHECK(!fs_mount.empty());
 
   blink::WebFrame* webframe = blink::WebFrame::frameForCurrentContext();
   const GURL origin = GURL(webframe->document().securityOrigin().toString());
-  const std::string fs_name = fileapi::GetIsolatedFileSystemName(origin, fsid);
+  std::string fs_name =
+      fileapi::GetFileSystemName(origin, fileapi::kFileSystemTypeExternal);
+  fs_name.append("_");
+  fs_name.append(fs_mount);
   const GURL root_url(
-      fileapi::GetIsolatedFileSystemRootURIString(
-          origin, fsid, extension_misc::kMediaFileSystemPathPart));
+      fileapi::GetExternalFileSystemRootURIString(origin, fs_mount));
   args.GetReturnValue().Set(
-      blink::WebDOMFileSystem::create(
-          webframe,
-          blink::WebFileSystemTypeIsolated,
-          blink::WebString::fromUTF8(fs_name),
-          root_url).toV8Value());
+      blink::WebDOMFileSystem::create(webframe,
+                                      blink::WebFileSystemTypeExternal,
+                                      blink::WebString::fromUTF8(fs_name),
+                                      root_url).toV8Value());
 }
 
 }  // namespace