Cleanup: Fix some lint/style errors in extensions code.

chrome/renderer/extensions/media_galleries_custom_bindings.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/extensions/media_galleries_custom_bindings.h"
 
 #include <string>
 
 #include "chrome/common/extensions/extension_constants.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "v8/include/v8.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 namespace extensions {
 
 namespace {
 
 // FileSystemObject GetMediaFileSystem(string file_system_url): construct
 // a file system object from a file system url.
 void GetMediaFileSystemObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
-  if (args.Length() != 1) {
-    NOTREACHED();
-    return;
-  }
-  if (!args[0]->IsString()) {
-    NOTREACHED();
-    return;
-  }
+  CHECK_EQ(1, args.Length());
+  CHECK(args[0]->IsString());
 
   std::string fsid(*v8::String::Utf8Value(args[0]));
-  if (fsid.empty()) {
-    NOTREACHED();
-    return;
-  }
+  CHECK(!fsid.empty());
 
   blink::WebFrame* webframe = blink::WebFrame::frameForCurrentContext();
   const GURL origin = GURL(webframe->document().securityOrigin().toString());
   const std::string fs_name = fileapi::GetIsolatedFileSystemName(origin, fsid);
   const std::string root_url =
       fileapi::GetIsolatedFileSystemRootURIString(
           origin, fsid, extension_misc::kMediaFileSystemPathPart);
   args.GetReturnValue().Set(
       webframe->createFileSystem(blink::WebFileSystemTypeIsolated,
                                  blink::WebString::fromUTF8(fs_name),
                                  blink::WebString::fromUTF8(root_url)));
 }
 
 }  // namespace
 
 MediaGalleriesCustomBindings::MediaGalleriesCustomBindings(
     Dispatcher* dispatcher, ChromeV8Context* context)
     : ChromeV8Extension(dispatcher, context) {
   RouteFunction("GetMediaFileSystemObject",
                 base::Bind(&GetMediaFileSystemObject));
 }
 
 }  // namespace extensions