[core] Move OnlineFileSource to platform

Preparation for OfflineFileSource which depends on SQLite

gyp/platform-android.gypi

@@ -20,6 +20,8 @@
         '../platform/default/png_reader.cpp',
         '../platform/default/jpeg_reader.cpp',
         '../platform/default/timer.cpp',
+        '../platform/default/default_file_source.cpp',
+        '../platform/default/online_file_source.cpp',
       ],
 
       'variables': {

gyp/platform-ios.gypi

@@ -13,6 +13,8 @@
         '../platform/default/async_task.cpp',
         '../platform/default/run_loop.cpp',
         '../platform/default/timer.cpp',
+        '../platform/default/default_file_source.cpp',
+        '../platform/default/online_file_source.cpp',
         '../platform/darwin/log_nslog.mm',
         '../platform/darwin/string_nsstring.mm',
         '../platform/darwin/application_root.mm',

gyp/platform-linux.gypi

@@ -21,6 +21,8 @@
         '../platform/default/png_reader.cpp',
         '../platform/default/jpeg_reader.cpp',
         '../platform/default/timer.cpp',
+        '../platform/default/default_file_source.cpp',
+        '../platform/default/online_file_source.cpp',
       ],
 
       'variables': {

gyp/platform-osx.gypi

@@ -13,6 +13,8 @@
         '../platform/default/async_task.cpp',
         '../platform/default/run_loop.cpp',
         '../platform/default/timer.cpp',
+        '../platform/default/default_file_source.cpp',
+        '../platform/default/online_file_source.cpp',
         '../platform/darwin/log_nslog.mm',
         '../platform/darwin/string_nsstring.mm',
         '../platform/darwin/application_root.mm',

platform/default/default_file_source.cpp

@@ -1,5 +1,6 @@
 #include <mbgl/storage/default_file_source.hpp>
-#include <mbgl/storage/online_file_source.hpp>
+
+#include "online_file_source.hpp"
 
 namespace mbgl {
 

platform/default/online_file_source.cpp

@@ -1,4 +1,4 @@
-#include <mbgl/storage/online_file_source.hpp>
+#include "online_file_source.hpp"
 #include <mbgl/storage/asset_context_base.hpp>
 #include <mbgl/storage/http_context_base.hpp>
 #include <mbgl/storage/network_status.hpp>