Cast provider fields values to the right Provider class in BoundField…

…Module.

Before this patch a ClassCastException would be thrown if a
javax.inject.Provider was used with @Bind, because the code would try to cast it
to com.google.inject.Provider.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=105098115

extensions/testlib/src/com/google/inject/testing/fieldbinder/BoundFieldModule.java

@@ -324,7 +324,8 @@ private void bindField(final BoundFieldInfo fieldInfo) {
       }
       // This is safe because we checked that the field's type is Provider above.
       @SuppressWarnings("unchecked")
-      Provider<?> fieldValueUnsafe = (Provider<?>) getFieldValue(fieldInfo);
+      javax.inject.Provider<?> fieldValueUnsafe =
+          (javax.inject.Provider<?>) getFieldValue(fieldInfo);
       binderUnsafe.toProvider(fieldValueUnsafe);
     } else if (fieldInfo.bindAnnotation.lazy()) {
       binderUnsafe.toProvider(new Provider<Object>() {

extensions/testlib/test/com/google/inject/testing/fieldbinder/BoundFieldModuleTest.java

@@ -351,6 +351,22 @@ public void testBindingProvider() {
     assertEquals(testValue, injector.getInstance(Integer.class));
   }
 
+  public void testBindingJavaxProvider() {
+    final Integer testValue = 1024;
+    Object instance = new Object() {
+      @Bind private javax.inject.Provider<Integer> anInt = new javax.inject.Provider<Integer>() {
+        @Override public Integer get() {
+          return testValue;
+        }
+      };
+    };
+
+    BoundFieldModule module = BoundFieldModule.of(instance);
+    Injector injector = Guice.createInjector(module);
+
+    assertEquals(testValue, injector.getInstance(Integer.class));
+  }
+
   public void testBindingNullField() {
     Object instance = new Object() {
       @Bind private Integer anInt = null;