Disable RTTI and C++ exceptions

chrome/browser/cocoa/nsimage_cache.mm

Index: chrome/browser/cocoa/nsimage_cache.mm
===================================================================
--- chrome/browser/cocoa/nsimage_cache.mm	(revision 23061)
+++ chrome/browser/cocoa/nsimage_cache.mm	(working copy)
@@ -7,6 +7,15 @@
 #include "base/logging.h"
 #include "base/mac_util.h"
 
+// When C++ exceptions are disabled, the C++ library defines |try| and
+// |catch| so as to allow exception-expecting C++ code to build properly when
+// language support for exceptions is not present.  These macros interfere
+// with the use of |@try| and |@catch| in Objective-C files such as this one.
+// Undefine these macros here, after everything has been #included, since
+// there will be no C++ uses and only Objective-C uses from this point on.
+#undef try
+#undef catch
+
 namespace nsimage_cache {
 
 static NSMutableDictionary *image_cache = nil;
@@ -53,4 +62,4 @@
   [image_cache removeAllObjects];
 }
 
-}  // nsimage_cache
+}  // namespace nsimage_cache