Backed out changeset 9c456120ed57 (bug 917226) for browser-chrome failures

--HG--
extra : rebase_source : f2780e4762b1537a07100be52f6949b201f24dc1

toolkit/devtools/Loader.jsm

@@ -120,7 +120,6 @@ SrcdirProvider.prototype = {
     let clientURI = this.fileURI(OS.Path.join(toolkitDir, "client"));
     let prettyFastURI = this.fileURI(OS.Path.join(toolkitDir), "pretty-fast.js");
     let asyncUtilsURI = this.fileURI(OS.Path.join(toolkitDir), "async-utils.js");
-    let contentObserverURI = this.fileURI(OS.Path.join(toolkitDir), "content-observer.js");
     let gcliURI = this.fileURI(OS.Path.join(toolkitDir, "gcli", "source", "lib", "gcli"));
     let acornURI = this.fileURI(OS.Path.join(toolkitDir, "acorn"));
     let acornWalkURI = OS.Path.join(acornURI, "walk.js");
@@ -145,7 +144,6 @@ SrcdirProvider.prototype = {
         "devtools/client": clientURI,
         "devtools/pretty-fast": prettyFastURI,
         "devtools/async-utils": asyncUtilsURI,
-        "devtools/content-observer": contentObserverURI,
         "gcli": gcliURI,
         "acorn": acornURI,
         "acorn/util/walk": acornWalkURI