Changed background color to be a const

gfx/src/nsIImageGroup.h

@@ -99,7 +99,7 @@ public:
    */
   virtual nsIImageRequest* GetImage(const char* aUrl, 
                                     nsIImageRequestObserver *aObserver,
-                                    nscolor* aBackgroundColor,
+                                    const nscolor* aBackgroundColor,
                                     PRUint32 aWidth, PRUint32 aHeight,
                                     PRUint32 aFlags) = 0;
 

gfx/src/nsImageGroup.cpp

@@ -57,7 +57,7 @@ public:
 
   virtual nsIImageRequest* GetImage(const char* aUrl, 
                                     nsIImageRequestObserver *aObserver,
-                                    nscolor* aBackgroundColor,
+                                    const nscolor* aBackgroundColor,
                                     PRUint32 aWidth, PRUint32 aHeight,
                                     PRUint32 aFlags);
   
@@ -202,7 +202,7 @@ ImageGroupImpl::RemoveObserver(nsIImageGroupObserver *aObserver)
 nsIImageRequest* 
 ImageGroupImpl::GetImage(const char* aUrl, 
                          nsIImageRequestObserver *aObserver,
-                         nscolor* aBackgroundColor,
+                         const nscolor* aBackgroundColor,
                          PRUint32 aWidth, PRUint32 aHeight,
                          PRUint32 aFlags)
 {

gfx/src/nsImageRequest.cpp

@@ -45,7 +45,7 @@ nsresult
 ImageRequestImpl::Init(IL_GroupContext *aGroupContext, 
 		       const char* aUrl, 
 		       nsIImageRequestObserver *aObserver,
-		       nscolor* aBackgroundColor,
+		       const nscolor* aBackgroundColor,
 		       PRUint32 aWidth, PRUint32 aHeight,
 		       PRUint32 aFlags)
 {

gfx/src/nsImageRequest.h

@@ -34,7 +34,7 @@ public:
   
   nsresult Init(IL_GroupContext *aGroupContext, const char* aUrl, 
                 nsIImageRequestObserver *aObserver,
-                nscolor* aBackgroundColor,
+                const nscolor* aBackgroundColor,
                 PRUint32 aWidth, PRUint32 aHeight,
                 PRUint32 aFlags);