Cleanup: Delete sk_tools::make_filepath() in favor of SkOSPath::SkPathJoin().

tools/render_pdfs_main.cpp

Index: tools/render_pdfs_main.cpp
diff --git a/tools/render_pdfs_main.cpp b/tools/render_pdfs_main.cpp
index fd078d3901643222f2c8baf3a3eb7c4562ed7daa..5e337009c6c9a3af5c8725303286ffb2cacd1c8a 100644
--- a/tools/render_pdfs_main.cpp
+++ b/tools/render_pdfs_main.cpp
@@ -111,7 +111,7 @@ static SkData* encode_to_dct_data(size_t*, const SkBitmap& bitmap) {
  */
 static bool make_output_filepath(SkString* path, const SkString& dir,
                                  const SkString& name) {
-    sk_tools::make_filepath(path, dir, name);
+    *path = SkOSPath::SkPathJoin(dir.c_str(), name.c_str());
     return replace_filename_extension(path,
                                       SKP_FILE_EXTENSION,
                                       PDF_FILE_EXTENSION);
@@ -197,8 +197,7 @@ static int process_input(const SkString& input, const SkString& outputDir,
         SkOSFile::Iter iter(input.c_str(), SKP_FILE_EXTENSION);
         SkString inputFilename;
         while (iter.next(&inputFilename)) {
-            SkString inputPath;
-            sk_tools::make_filepath(&inputPath, input, inputFilename);
+            SkString inputPath = SkOSPath::SkPathJoin(input.c_str(), inputFilename.c_str());
             if (!render_pdf(inputPath, outputDir, renderer)) {
                 ++failures;
             }