Fixing layout in js output (use full paths rather than just the library name)

test/codegen/expect/fieldtest/fieldtest.js

-var fieldtest;
-(function(fieldtest) {
-  'use strict';
-  class A extends dart.Object {
-    A() {
-      this.x = 42;
-    }
-  }
-  let B$ = dart.generic(function(T) {
-    class B extends dart.Object {
-      B() {
-        this.x = dart.as(null, core.int);
-        this.y = null;
-        this.z = dart.as(null, T);
-      }
-    }
-    return B;
-  });
-  let B = B$(dynamic);
-  // Function foo: (A) → int
-  function foo(a) {
-    core.print(a.x);
-    return a.x;
-  }
-  // Function bar: (dynamic) → int
-  function bar(a) {
-    core.print(dart.dload(a, 'x'));
-    return dart.as(dart.dload(a, 'x'), core.int);
-  }
-  // Function baz: (A) → dynamic
-  function baz(a) {
-    return a.x;
-  }
-  // Function compute: () → int
-  function compute() {
-    return 123;
-  }
-  dart.defineLazyProperties(fieldtest, {
-    get y() {
-      return compute() + 444;
-    },
-    set y() {}
-  });
-  dart.copyProperties(fieldtest, {
-    get q() {
-      return core.String['+'](core.String['+']('life, ', 'the universe '), 'and everything');
-    },
-    get z() {
-      return 42;
-    },
-    set z(value) {
-      fieldtest.y = dart.as(value, core.int);
-    }
-  });
-  // Function main: () → void
-  function main() {
-    let a = new A();
-    foo(a);
-    bar(a);
-    core.print(baz(a));
-  }
-  // Exports:
-  fieldtest.A = A;
-  fieldtest.B = B;
-  fieldtest.B$ = B$;
-  fieldtest.foo = foo;
-  fieldtest.bar = bar;
-  fieldtest.baz = baz;
-  fieldtest.compute = compute;
-  fieldtest.q = q;
-  fieldtest.z = z;
-  fieldtest.z = z;
-  fieldtest.main = main;
-})(fieldtest || (fieldtest = {}));