Cleanup: Remove an obsolete TODO.

chrome/chrome_exe.gypi

Index: chrome/chrome_exe.gypi
===================================================================
--- chrome/chrome_exe.gypi	(revision 149943)
+++ chrome/chrome_exe.gypi	(working copy)
@@ -416,15 +416,12 @@
                 '../pdf/pdf.gyp:pdf',
               ],
               'conditions': [
-                # TODO(thestig) It would be nice to do this for CrOS as well,
-                # but when I tried that, it failed because dump_syms is built
-                # for the target arch rather than the host arch.
-                # http://crbug.com/140571
+                # CrOS does this in a separate build step.
                 ['OS=="linux" and chromeos==0 and linux_dump_symbols==1', {
                   'dependencies': [
                     '../pdf/pdf.gyp:pdf_linux_symbols',
                   ],
-                }], # OS=="linux" and linux_dump_symbols==1
+                }], # OS=="linux" and chromeos==0 and linux_dump_symbols==1
               ],
             }], # internal_pdf
           ],