Move ThemeHandler from c/c/e/api; move GetBrowserImages() out of Extension class

chrome/browser/extensions/sandboxed_unpacker.cc

Index: chrome/browser/extensions/sandboxed_unpacker.cc
diff --git a/chrome/browser/extensions/sandboxed_unpacker.cc b/chrome/browser/extensions/sandboxed_unpacker.cc
index 527cd341c5278be9350a94ee4dd538dd2d541d2d..e8801e2bf01f4329f519d44acb6f50d688bb53ed 100644
--- a/chrome/browser/extensions/sandboxed_unpacker.cc
+++ b/chrome/browser/extensions/sandboxed_unpacker.cc
@@ -641,7 +641,8 @@ bool SandboxedUnpacker::RewriteImageFiles() {
   // Delete any images that may be used by the browser.  We're going to write
   // out our own versions of the parsed images, and we want to make sure the
   // originals are gone for good.
-  std::set<base::FilePath> image_paths = extension_->GetBrowserImages();
+  std::set<base::FilePath> image_paths =
+      extension_file_util::GetExtensionBrowserImages(extension_);
   if (image_paths.size() != images.size()) {
     // Decoded images don't match what's in the manifest.
     ReportFailure(