Fix more warnings on linux

Source/core/platform/graphics/chromium/ImageDecodingStore.h

Index: Source/core/platform/graphics/chromium/ImageDecodingStore.h
diff --git a/Source/core/platform/graphics/chromium/ImageDecodingStore.h b/Source/core/platform/graphics/chromium/ImageDecodingStore.h
index 8fc7d1297cf4ac695f5645ef59f2b21fec75977f..370146bd3e06b6d4a1884730708222e6593dd799 100644
--- a/Source/core/platform/graphics/chromium/ImageDecodingStore.h
+++ b/Source/core/platform/graphics/chromium/ImageDecodingStore.h
@@ -116,9 +116,9 @@ public:
     void clear();
     void setCacheLimitInBytes(size_t);
     size_t memoryUsageInBytes();
-    unsigned cacheEntries();
-    unsigned imageCacheEntries();
-    unsigned decoderCacheEntries();
+    int cacheEntries();

[Nico, 2013/10/29 15:51:30]

nit: Is it easy to change this the other way round? Functions returning a size
look nicer to me if returning unsigned.

[lgombos, 2013/10/29 17:33:16]

I think this is more involved, I will take a look in a follow-up patch.

+    int imageCacheEntries();
+    int decoderCacheEntries();
 
 private:
     // Image cache entry is identified by: