Bug 1415014 - Part 2. Remove duplicated icon48.png from branding files. r=dao

default48.png and icon48.png is same file.  So we should remove one side.

MozReview-Commit-ID: 6WuxH0QFQ25

--HG--
extra : rebase_source : 1f6545daf3968fa06079358c7a3edce6a484a582

browser/branding/aurora/content/jar.mn

@@ -10,7 +10,7 @@ browser.jar:
   content/branding/about-wordmark.svg
   content/branding/icon16.png                    (../default16.png)
   content/branding/icon32.png                    (../default32.png)
-  content/branding/icon48.png
+  content/branding/icon48.png                    (../default48.png)
   content/branding/icon64.png                    (../default64.png)
   content/branding/icon128.png                   (../default128.png)
   content/branding/identity-icons-brand.svg

browser/branding/nightly/content/jar.mn

@@ -10,7 +10,7 @@ browser.jar:
   content/branding/about-wordmark.svg
   content/branding/icon16.png                    (../default16.png)
   content/branding/icon32.png                    (../default32.png)
-  content/branding/icon48.png
+  content/branding/icon48.png                    (../default48.png)
   content/branding/icon64.png                    (../default64.png)
   content/branding/icon128.png                   (../default128.png)
   content/branding/identity-icons-brand.svg

browser/branding/official/content/jar.mn

@@ -10,7 +10,7 @@ browser.jar:
   content/branding/about-wordmark.svg
   content/branding/icon16.png                    (../default16.png)
   content/branding/icon32.png                    (../default32.png)
-  content/branding/icon48.png
+  content/branding/icon48.png                    (../default48.png)
   content/branding/icon64.png                    (../default64.png)
   content/branding/icon128.png                   (../mozicon128.png)
   content/branding/identity-icons-brand.svg

browser/branding/unofficial/content/jar.mn

@@ -11,7 +11,7 @@ browser.jar:
   content/branding/about-wordmark.svg
   content/branding/icon16.png                    (../default16.png)
   content/branding/icon32.png                    (../default32.png)
-  content/branding/icon48.png
+  content/branding/icon48.png                    (../default48.png)
   content/branding/icon64.png                    (../default64.png)
   content/branding/icon128.png                   (../default128.png)
   content/branding/identity-icons-brand.svg