Mac: Port deprecated methods to 10.8+ alternatives in install_from_dmg.mm.

base/mac/sdk_forward_declarations.h

Index: base/mac/sdk_forward_declarations.h
diff --git a/base/mac/sdk_forward_declarations.h b/base/mac/sdk_forward_declarations.h
index a4b64dc153d91e2533930952f3d4f1cf7726bd21..954b3fe63c0486ff1729d44ff82d5d49e6087125 100644
--- a/base/mac/sdk_forward_declarations.h
+++ b/base/mac/sdk_forward_declarations.h
@@ -129,6 +129,12 @@ BASE_EXPORT extern NSString* const NSAppearanceNameVibrantLight;
 - (void)setObject:(id)obj forKeyedSubscript:(id<NSCopying>)key;
 @end
 
+@interface NSFileManager (MountainLionSDK)
+- (BOOL)trashItemAtURL:(NSURL*)url
+      resultingItemURL:(NSURL**)outResultingURL
+                 error:(NSError**)error;
+@end
+
 #endif  // MAC_OS_X_VERSION_10_8
 
 // Once Chrome no longer supports OSX 10.8, everything within this preprocessor