Remove deprecated v7 MediaStyle + dependency

Remove the deprecated v7 MediaStyle and
DecoratedMediaCustomViewStyle classes as they have
been fully replaced with the v4.media versions in the
Media Compat Support Library.

This also allows us to remove the dependency between
AppCompat and Media Compat: it can now depend only on
support-core-utils and support-fragment. This exposed
a missing direct dependency between mediarouter and
media-compat.

Test: ./gradlew assemble && ./gradlew checkApi

BUG: 33042051
Change-Id: Iecafe01a56c1b5b5f5dbeae4e2d062f11698b353
diff --git a/v7/appcompat/build.gradle b/v7/appcompat/build.gradle
index 946faf0..a0e5290 100644
--- a/v7/appcompat/build.gradle
+++ b/v7/appcompat/build.gradle
@@ -2,7 +2,8 @@
 
 dependencies {
     api project(':support-annotations')
-    api project(':support-v4')
+    api project(':support-core-utils')
+    api project(':support-fragment')
     api project(':support-vector-drawable')
     api project(':animated-vector-drawable')