Switch to using SourceLocation universally in service protocol.

runtime/observatory/lib/src/elements/function_view.html

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="class_ref.html">
 <link rel="import" href="code_ref.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="library_ref.html">
 <link rel="import" href="observatory_element.html">
 <link rel="import" href="nav_bar.html">
 <link rel="import" href="script_inset.html">
 <link rel="import" href="script_ref.html">
 <link rel="import" href="view_footer.html">
@@ skipping 28 matching lines @@
         </div>
         <div class="memberItem">
           <div class="memberName">owner</div>
           <div class="memberValue">
             <any-service-ref ref="{{ function.dartOwner }}"></any-service-ref>
           </div>
         </div>
         <div class="memberItem">
           <div class="memberName">script</div>
           <div class="memberValue">
-            <script-ref ref="{{ function.script }}"
-                        pos="{{ function.tokenPos }}">
-            </script-ref>
+            <source-link location="{{ function.location }}"></source-link>
           </div>
         </div>
 
         <div class="memberItem">&nbsp;</div>
 
         <template if="{{ function.code != null }}">
           <div class="memberItem">
             <div class="memberName">optimized code</div>
             <div class="memberValue">
               <code-ref ref="{{ function.code }}"></code-ref>
@@ skipping 29 matching lines @@
            <div class="memberItem">
              <div class="memberName">vm name</div>
              <div class="memberValue">{{ function.vmName }}</div>
            </div>
          </template>
        </div>
     </div>
 
     <div class="content-centered-big">
       <hr>
-      <script-inset script="{{ function.script }}"
-                    startPos="{{ function.tokenPos }}"
-                    endPos="{{ function.endTokenPos }}">
-      </script-inset>
+      <source-inset location="{{ function.location }}"></source-inset>
     </div>
 
     <view-footer></view-footer>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="function_view.dart"></script>