Keep Chromium ObjC column limit at 80 for consistency with C++

[danbeam]

Summary

At the moment, all of Chromium's ObjC code is wrapped at 80 columns.

Google's ObjC style recently changed to 100 columns:
https://github.com/llvm-mirror/clang/commit/f57fa8e1d4cb815ab145f01770565f4e4441ca1b

Chromium is likely to want to keep to 80 columns for consistency with C++, but it's not yet super duper clear. This is being decided here:
https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/De-RNhaGozs

However, it is clear that Chromium's presubmit tooling is not yet ready for a change in column limit:
https://bugs.chromium.org/p/chromium/issues/detail?id=686650

Let's keep Chromium ObjC to 80 cols while this is all figured out.

[thakis]

r293675

Format/Format.cpp

if (Language == FormatStyle::LK_Java) {
     ChromiumStyle.AllowShortLoopsOnASingleLine = false;
   } else {
     ChromiumStyle.AllowAllParametersOfDeclarationOnNextLine = false;
     ChromiumStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_Inline;
     ChromiumStyle.AllowShortIfStatementsOnASingleLine = false;
     ChromiumStyle.AllowShortLoopsOnASingleLine = false;
     ChromiumStyle.BinPackParameters = false;
     ChromiumStyle.DerivePointerAlignment = false;
+    if (Language == FormatStyle::LK_ObjC)
+      ChromiumStyle.ColumnLimit = 80;
   }
   ChromiumStyle.SortIncludes = false;
   return ChromiumStyle;
 }
 
 FormatStyle getMozillaStyle() {
   FormatStyle MozillaStyle = getLLVMStyle();
   MozillaStyle.AllowAllParametersOfDeclarationOnNextLine = false;