Make libwebviewchromium_plat_support.so public

Add libwebviewchromium_plat_support.so to the list
of public libraries.

Bug: http://b/26461431
Change-Id: I958a1182198bf59d9b6fc818953212ce505d6bdd

libnativeloader/native_loader.cpp

@@ -49,6 +49,7 @@ static const char* kPublicNativeLibraries = "libandroid.so:"
                                             "libOpenMAXAL.so:"
                                             "libOpenSLES.so:"
                                             "libstdc++.so:"
+                                            "libwebviewchromium_plat_support.so:"
                                             "libz.so";
 
 class LibraryNamespaces {