[android_webview] Do not extract webviewchromium.pak

ui/base/resource/resource_bundle.cc

Index: ui/base/resource/resource_bundle.cc
diff --git a/ui/base/resource/resource_bundle.cc b/ui/base/resource/resource_bundle.cc
index cddb88ea0a7de5d6a8aea74e65f059b9ef9d03a1..62f95c9f7acc64061bc7b7832db711952181ee48 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -176,13 +176,23 @@ std::string ResourceBundle::InitSharedInstanceLocaleOnly(
 // static
 void ResourceBundle::InitSharedInstanceWithPakFile(
     base::File pak_file, bool should_load_common_resources) {
+  InitSharedInstanceWithPakFileRegion(pak_file.Pass(),
+                                      base::File::Region::WholeFile(),
+                                      should_load_common_resources);
+}
+
+// static
+void ResourceBundle::InitSharedInstanceWithPakFileRegion(
+    base::File pak_file,
+    const base::File::Region& region,
+    bool should_load_common_resources) {
   InitSharedInstance(NULL);
   if (should_load_common_resources)
     g_shared_instance_->LoadCommonResources();
 
   scoped_ptr<DataPack> data_pack(
       new DataPack(SCALE_FACTOR_100P));
-  if (!data_pack->LoadFromFile(pak_file.Pass())) {
+  if (!data_pack->LoadFromFileRegion(pak_file.Pass(), region)) {
     NOTREACHED() << "failed to load pak file";
     return;
   }