[gin] Turn gin into a component

gin/modules/file_module_provider.h

Index: gin/modules/file_module_provider.h
diff --git a/gin/modules/file_module_provider.h b/gin/modules/file_module_provider.h
index 89e83b3b2e6bf3e0f13b6f00a2a945a77fd6a392..dd75a0feaf1ef2d7e0031533c15ae3e7cd0928a1 100644
--- a/gin/modules/file_module_provider.h
+++ b/gin/modules/file_module_provider.h
@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/files/file_path.h"
+#include "gin/gin_export.h"
 #include "gin/runner.h"
 
 namespace gin {
@@ -18,7 +19,7 @@ namespace gin {
 // modules in the directories indiciated by |search_paths|. Although we still
 // read from the file system on the main thread, we'll eventually want to move
 // the reads to a background thread.
-class FileModuleProvider {
+class GIN_EXPORT FileModuleProvider {
  public:
   explicit FileModuleProvider(
       const std::vector<base::FilePath>& search_paths);