Make MountPointProvider pluggable from outside webkit/fileapi

content/browser/fileapi/fileapi_message_filter.cc

Index: content/browser/fileapi/fileapi_message_filter.cc
diff --git a/content/browser/fileapi/fileapi_message_filter.cc b/content/browser/fileapi/fileapi_message_filter.cc
index ac81220e319ef79db300da9f4a555b4fc07d4e28..bd53c00343bee2f991252485e1a8f8cb8447885f 100644
--- a/content/browser/fileapi/fileapi_message_filter.cc
+++ b/content/browser/fileapi/fileapi_message_filter.cc
@@ -784,7 +784,7 @@ void FileAPIMessageFilter::DidCreateSnapshot(
     //   already been granted read permission for the file's nominal path, but
     //   for drive files, platform paths differ from the nominal paths.
     DCHECK(snapshot_file ||
-           fileapi::SandboxMountPointProvider::CanHandleType(url.type()) ||
+           fileapi::SandboxMountPointProvider::IsSandboxType(url.type()) ||
            url.type() == fileapi::kFileSystemTypeDrive);
     ChildProcessSecurityPolicyImpl::GetInstance()->GrantReadFile(
         process_id_, platform_path);
@@ -856,7 +856,7 @@ void FileAPIMessageFilter::RegisterFileAsBlob(
     //   already been granted read permission for the file's nominal path, but
     //   for drive files, platform paths differ from the nominal paths.
     DCHECK(shareable_file ||
-           fileapi::SandboxMountPointProvider::CanHandleType(url.type()) ||
+           fileapi::SandboxMountPointProvider::IsSandboxType(url.type()) ||
            url.type() == fileapi::kFileSystemTypeDrive);
     ChildProcessSecurityPolicyImpl::GetInstance()->GrantReadFile(
         process_id_, platform_path);