Bug 1034689 part 3 - Fix remaining places in Gecko to handle Latin1 strings. r=bz

widget/android/NativeJSContainer.cpp

@@ -7,6 +7,7 @@
 #include "AndroidBridge.h"
 #include "mozilla/Vector.h"
 #include "prthread.h"
+#include "nsJSUtils.h"
 
 using namespace mozilla;
 using namespace mozilla::widget;
@@ -502,14 +503,11 @@ struct StringProperty
 
     static Type FromValue(JNIEnv* env, jobject instance,
                           JSContext* cx, const JS::HandleString str) {
-        size_t strLen = 0;
-        const jschar* const strChars =
-            JS_GetStringCharsAndLength(cx, str, &strLen);
-        if (!CheckJSCall(env, !!strChars)) {
+        nsAutoJSString autoStr;
+        if (!CheckJSCall(env, autoStr.init(cx, str))) {
             return nullptr;
         }
-        jstring ret = env->NewString(
-            reinterpret_cast<const jchar*>(strChars), strLen);
+        jstring ret = env->NewString(autoStr.BeginReading(), autoStr.Length());
         MOZ_ASSERT(ret);
         return ret;
     }