Use appdata.xml and desktop files from upstream

Instead of importing a copy here.

com.google.Chrome.json

@@ -1,5 +1,8 @@
 {
     "app-id": "com.google.Chrome",
+    "rename-appdata-file": "google-chrome.appdata.xml",
+    "rename-desktop-file": "google-chrome.desktop",
+    "rename-icon": "google-chrome",
     "runtime": "org.freedesktop.Platform",
     "runtime-version": "1.6",
     "sdk": "org.freedesktop.Sdk",
@@ -18,11 +21,26 @@
                 },
                 {
                     "type": "file",
-                    "path": "com.google.Chrome.appdata.xml"
+                    "url": "https://raw.githubusercontent.com/chromium/chromium/68.0.3440.84/chrome/installer/linux/common/desktop.template",
+                    "sha256": "0ed6e52311026e0f4e98d7f94832eddf59f0b9d5114551f5e9ad886050f48d21",
+                    "dest": "metadata"
                 },
                 {
                     "type": "file",
-                    "path": "com.google.Chrome.desktop"
+                    "url": "https://raw.githubusercontent.com/chromium/chromium/68.0.3440.84/chrome/installer/linux/common/google-chrome/google-chrome.appdata.xml.template",
+                    "sha256": "053cdc185c4687ad93b32b4725619993104e5cf16134adaf493327b089fd3098",
+                    "dest": "metadata"
+                },
+                {
+                    "type": "file",
+                    "url": "https://raw.githubusercontent.com/chromium/chromium/68.0.3440.84/chrome/installer/linux/common/google-chrome/google-chrome.info",
+                    "sha256": "f41cd84a84956ff339e7c0fd2e730d18ad2d712eb67c986bfe5f66c8d1c17084",
+                    "dest": "metadata"
+                },
+                {
+                    "type": "file",
+                    "path": "metadata-writer",
+                    "dest": "metadata"
                 },
                 {
                     "type": "file",
@@ -41,13 +59,10 @@
                 "install -d /app/bin",
                 "install google-chrome-launcher /app/bin/google-chrome-launcher",
 
-                "install -d /app/share/appdata",
-                "install -m644 com.google.Chrome.appdata.xml /app/share/appdata/com.google.Chrome.appdata.xml",
-
-                "install -d /app/share/applications",
-                "install -m644 com.google.Chrome.desktop /app/share/applications/com.google.Chrome.desktop",
+                "chmod +x metadata/metadata-writer",
+                "cd metadata && ./metadata-writer",
 
-                "for icon_size in 64 128 256; do install -d /app/share/icons/hicolor/${icon_size}x${icon_size}/apps; install -m644 product_logo_${icon_size}.png /app/share/icons/hicolor/${icon_size}x${icon_size}/apps/com.google.Chrome.png; done"
+                "for icon_size in 64 128 256; do install -d /app/share/icons/hicolor/${icon_size}x${icon_size}/apps; install -m644 product_logo_${icon_size}.png /app/share/icons/hicolor/${icon_size}x${icon_size}/apps/google-chrome.png; done"
             ]
         },
         {

metadata-writer

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+source google-chrome.info
+
+do_subst () {
+    sed -e "s|@@FULLDESC@@|${FULLDESC}|g" \
+        -e "s|@@MENUNAME@@|${MENUNAME}|g" \
+        -e "s|@@PACKAGE@@|${PACKAGE}|g" \
+        -e "s|@@PRODUCTURL@@|${PRODUCTURL}|g" \
+        -e "s|@@SHORTDESC@@|${SHORTDESC}|g" \
+        -e "s|/usr/bin/@@USR_BIN_SYMLINK_NAME@@|google-chrome-launcher|g" \
+        $1 > $2
+    echo "Generated $2 from $1"
+}
+
+install -d /app/share/applications
+install -d /app/share/appdata
+
+do_subst desktop.template /app/share/applications/google-chrome.desktop
+do_subst google-chrome.appdata.xml.template /app/share/appdata/google-chrome.appdata.xml