Move _truncatedValue ivar into interface

Popup.h

@@ -30,6 +30,7 @@
     NSString* prefix_;
     double score_;
     double hitMultiplier_;
+    NSString *_truncatedValue;
 }
 @property(nonatomic, readonly) NSString *truncatedValue;

Popup.m

@@ -44,9 +44,7 @@ DebugLog([NSString stringWithFormat:args]); \
 } while (0)
 #endif
-@implementation PopupEntry {
-  NSString *_truncatedValue;
-}
+@implementation PopupEntry
 - (void)setTruncatedValue:(NSString *)truncatedValue {
     [_truncatedValue autorelease];