Remove default_shared_libs

system_shared_libs has been modified to have the same behavior as
the newly added default_shared_libs, remove default_shared_libs in
favor of system_shared_libs.

This reverts Ia2349d84c70e503916f90a5d2702e135248f73df and renames
the default_shared_libs property in cc_object (which never had
system_shared_libs) to system_shared_libs.

Bug: 193559105
Test: m checkbuild
Change-Id: I46672e3a096b6ea94ff4c10e1c31e8fd010a163c
diff --git a/bp2build/cc_object_conversion_test.go b/bp2build/cc_object_conversion_test.go
index 8ede226..869be20 100644
--- a/bp2build/cc_object_conversion_test.go
+++ b/bp2build/cc_object_conversion_test.go
@@ -46,7 +46,7 @@
 		blueprint: `cc_object {
     name: "foo",
     local_include_dirs: ["include"],
-    default_shared_libs: [],
+    system_shared_libs: [],
     cflags: [
         "-Wno-gcc-compat",
         "-Wall",
@@ -84,7 +84,7 @@
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
-    default_shared_libs: [],
+    system_shared_libs: [],
     local_include_dirs: ["include"],
     srcs: [
         "a/b/*.h",
@@ -137,14 +137,14 @@
 		},
 		blueprint: `cc_object {
     name: "foo",
-    default_shared_libs: [],
+    system_shared_libs: [],
     srcs: ["a/b/c.c"],
     objs: ["bar"],
 }
 
 cc_object {
     name: "bar",
-    default_shared_libs: [],
+    system_shared_libs: [],
     srcs: ["x/y/z.c"],
 }
 `,
@@ -182,7 +182,7 @@
 		},
 		blueprint: `cc_object {
     name: "foo",
-    default_shared_libs: [],
+    system_shared_libs: [],
     srcs: ["a/b/c.c"],
     include_build_directory: false,
 }
@@ -204,7 +204,7 @@
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
-    default_shared_libs: [],
+    system_shared_libs: [],
     include_build_directory: false,
     product_variables: {
         platform_sdk_version: {
@@ -233,7 +233,7 @@
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
-    default_shared_libs: [],
+    system_shared_libs: [],
     srcs: ["a.cpp"],
     arch: {
         x86: {
@@ -273,7 +273,7 @@
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
-    default_shared_libs: [],
+    system_shared_libs: [],
     srcs: ["base.cpp"],
     arch: {
         x86: {
@@ -329,7 +329,7 @@
 		moduleTypeUnderTestBp2BuildMutator: cc.ObjectBp2Build,
 		blueprint: `cc_object {
     name: "foo",
-    default_shared_libs: [],
+    system_shared_libs: [],
     srcs: ["base.cpp"],
     target: {
         android: {