Remove Dependency#get from ExtensionControllerImpl

Also deprecate Dependency#get.

Test: Updated existing tests
Change-Id: Ibdca61a4971e786c21f5a8bab215bc7a0b8ce7cb
diff --git a/packages/SystemUI/src/com/android/systemui/Dependency.java b/packages/SystemUI/src/com/android/systemui/Dependency.java
index 443e389..f51004a 100644
--- a/packages/SystemUI/src/com/android/systemui/Dependency.java
+++ b/packages/SystemUI/src/com/android/systemui/Dependency.java
@@ -531,10 +531,18 @@
         sDependency.destroyDependency(cls, destroy);
     }
 
+    /**
+     * @deprecated see docs/dagger.md
+     */
+    @Deprecated
     public static <T> T get(Class<T> cls) {
         return sDependency.getDependency(cls);
     }
 
+    /**
+     * @deprecated see docs/dagger.md
+     */
+    @Deprecated
     public static <T> T get(DependencyKey<T> cls) {
         return sDependency.getDependency(cls);
     }