Move fileapi into its own component

webkit/fileapi/isolated_context.h

Index: webkit/fileapi/isolated_context.h
diff --git a/webkit/fileapi/isolated_context.h b/webkit/fileapi/isolated_context.h
index cd2850c846456248a3b160e5a8292bd8f9635e76..6024ab3f4cee9557877d92167ee53135311a58c3 100644
--- a/webkit/fileapi/isolated_context.h
+++ b/webkit/fileapi/isolated_context.h
@@ -15,6 +15,7 @@
 #include "base/memory/singleton.h"
 #include "base/synchronization/lock.h"
 #include "base/lazy_instance.h"
+#include "webkit/fileapi/fileapi_export.h"
 
 namespace fileapi {
 
@@ -23,7 +24,7 @@ namespace fileapi {
 // a singleton and access to the context is thread-safe (protected with a
 // lock).
 // Some methods of this class are virtual just for mocking.
-class IsolatedContext {
+class FILEAPI_EXPORT IsolatedContext {
  public:
   // The instance is lazily created per browser process.
   static IsolatedContext* GetInstance();