GN fixes to make webkit_unit_tests link on android

Source/core/BUILD.gn

Index: Source/core/BUILD.gn
diff --git a/Source/core/BUILD.gn b/Source/core/BUILD.gn
index b911bee9bc57ebfb6efac0afb7e7d44f32ed046d..5eddca6809cee34f9ecc27cb288c88304442ae0e 100644
--- a/Source/core/BUILD.gn
+++ b/Source/core/BUILD.gn
@@ -240,7 +240,7 @@ source_set("remaining") {
       "rendering/RenderThemeChromiumFontProviderWin.cpp",
     ]
   }
-  if (!is_linux) {
+  if (!is_linux && !is_android) {
     sources -= [
       "rendering/RenderThemeChromiumFontProviderLinux.cpp",
     ]
@@ -277,13 +277,6 @@ source_set("remaining") {
       "editing/SmartReplaceCF.cpp",
     ]
   }
-
-  if (!use_default_render_theme) {
-    sources -= [
-      "rendering/RenderThemeChromiumDefault.cpp",
-      "rendering/RenderThemeChromiumDefault.h",
-    ]
-  }
 }
 
 # GYP version: //third_party/WebKit/Source/core/core.gyp:webcore_rendering