Revert 226920 "Roll Clang 188423:191856."

I suspect this caused a 25% sizes regression on Mac: http://build.chromium.org/f/chromium/perf/mac-release/sizes/report.html?history=150&rev=-1&graph=Chromium.app

> Roll Clang 188423:191856.
> 
> Remove libprofile_rt from package.sh, it doesn't exist after LLVM r191835
> 
> BUG=290204,303886
> R=thakis@chromium.org
> TBR=net owner
> NOTRY=true
> 
> Review URL: https://codereview.chromium.org/25875004

TBR=thakis@chromium.org

Review URL: https://codereview.chromium.org/25988002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@226978 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -3130,10 +3130,6 @@
                           '-fuse-ld=gold',
                           '-Wno-psabi',
                         ],
-                        'ldflags!': [
-                          # Clang does not support the following options.
-                          '-fuse-ld=gold',
-                        ],
                       }],
                     ],
                   }],
@@ -3218,12 +3214,6 @@
               # code generated by flex (used in angle) contains that keyword.
               # http://crbug.com/255186
               '-Wno-deprecated-register',
-
-              # TODO(hans): Remove once we've cleaned up the warnings.
-              '-Wno-unused-const-variable',
-
-              # This warns about auto_ptr<>, used in third-party code.
-              '-Wno-deprecated-declarations',
             ],
             'cflags!': [
               # Clang doesn't seem to know know this flag.
@@ -3927,12 +3917,6 @@
                 # code generated by flex (used in angle) contains that keyword.
                 # http://crbug.com/255186
                 '-Wno-deprecated-register',
-
-                # TODO(hans): Remove once we've cleaned up the warnings.
-                '-Wno-unused-const-variable',
-
-                # This warns about auto_ptr<>, used in third-party code.
-                '-Wno-deprecated-declarations',
               ],
             }],
             ['clang==1 and clang_use_chrome_plugins==1', {