Remove unecessary exported symbols from libhwui.so

Test: compiles and links
Bug: 150782769
Change-Id: Ib49c1bf914b6bfaad1fb29371115df7c9eec08d2
diff --git a/libs/hwui/pipeline/skia/ShaderCache.h b/libs/hwui/pipeline/skia/ShaderCache.h
index 0898017..5b8e668 100644
--- a/libs/hwui/pipeline/skia/ShaderCache.h
+++ b/libs/hwui/pipeline/skia/ShaderCache.h
@@ -37,7 +37,7 @@
      * "get" returns a pointer to the singleton ShaderCache object.  This
      * singleton object will never be destroyed.
      */
-    ANDROID_API static ShaderCache& get();
+    static ShaderCache& get();
 
     /**
      * initShaderDiskCache" loads the serialized cache contents from disk,