Yet another clang roll attempt.

To r126754

To handle clang making -fno-exceptions disabling ObjC exceptions, add -fobjc-exceptions for all files for now. This is a band-aid, see the bug below.

BUG=75001
TEST=none
TBR=hans

Review URL: http://codereview.chromium.org/6628002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@77032 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -1360,6 +1360,10 @@
                 # TODO(thakis): Use -isystem instead (http://crbug.com/58751 ).
                 '-Wno-unnamed-type-template-args',
               ],
+              'OTHER_CFLAGS': [
+                # TODO(thakis): Causes many warnings - http://crbug.com/75001
+                '-fobjc-exceptions',
+              ],
             }],
             ['clang==1 and clang_use_chrome_plugins==1', {
               'OTHER_CFLAGS': [