Refactor RenderThemeChromiumDefault

Source/core/core.gyp

Index: Source/core/core.gyp
diff --git a/Source/core/core.gyp b/Source/core/core.gyp
index bf643567ae4b5b81eddf2a9aea016e931ae8a357..623a9f0b1eae38df3ca089540b9a21b521fdc96f 100644
--- a/Source/core/core.gyp
+++ b/Source/core/core.gyp
@@ -562,6 +562,7 @@
         ['OS=="win"', {
           'sources/': [
             ['exclude', 'Posix\\.cpp$'],
+            ['include', 'rendering/RenderThemeChromiumDefault\\.cpp$'],
           ],
         },{ # OS!="win"
           'sources/': [
@@ -589,7 +590,11 @@
           # Due to a bug in gcc 4.6 in android NDK, we get warnings about uninitialized variable.
           'cflags': ['-Wno-uninitialized'],
         }],
-        ['OS != "linux"', {
+        ['OS == "linux"', {
+          'sources/': [
+            ['include', 'rendering/RenderThemeChromiumDefault\\.cpp$'],
+          ],
+        },{ # OS!="linux"
           'sources/': [
             ['exclude', 'Linux\\.cpp$'],
           ],
@@ -597,6 +602,7 @@
         ['OS=="android"', {
           'sources/': [
             ['include', 'rendering/RenderThemeChromiumFontProviderLinux\\.cpp$'],
+            ['include', 'rendering/RenderThemeChromiumLinux\\.cpp$'],
             ['include', 'rendering/RenderThemeChromiumDefault\\.cpp$'],
           ],
         },{ # OS!="android"