Replace usages of GetRawDataResource in chromecast/bindings/.

GetRawDataResource assumes that underlying files are not compressed,
whereas LoadDataResourceString automatically decompresses if necessary.

This is one of many CLs, in preparation of compressing all HTML, JS,
CSS, SVG files by default (meaning without requiring compress="gzip"
to be specified).

Bug: 1068407
Change-Id: I5aa8ae5036e7a9341da32b6d27317e2f5c30580d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147807
Commit-Queue: Luke Halliwell (slow) <halliwell@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758594}

chromecast/bindings/bindings_manager_cast.cc

@@ -28,7 +28,7 @@ const char kControlPortConnectMessage[] = "cast.master.connect";
 BindingsManagerCast::BindingsManagerCast() : cast_web_contents_(nullptr) {
   // NamedMessagePortConnector binding will be injected into page first.
   AddBinding(kNamedMessagePortConnectorBindingsId,
-             ui::ResourceBundle::GetSharedInstance().GetRawDataResource(
+             ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(
                  IDR_PORT_CONNECTOR_JS));
 }