Always use atom-shell as product name.

Since the symbols of atom-shell would be used by all third party
applications, it would make server handling more complicated if we allow
users to custom the uploaded product name. We should always use
atom-shell as product name when uploading so the server would not be
confused when searching symbols, and the user specified product name
could be show in UI.

common/crash_reporter/crash_reporter_mac.mm

@@ -34,7 +34,7 @@ void CrashReporterMac::InitBreakpad(const std::string& product_name,
   NSMutableDictionary* parameters =
       [NSMutableDictionary dictionaryWithCapacity:4];
 
-  [parameters setValue:base::SysUTF8ToNSString(product_name)
+  [parameters setValue:@"atom-shell"
                 forKey:@BREAKPAD_PRODUCT];
   [parameters setValue:base::SysUTF8ToNSString(product_name)
                 forKey:@BREAKPAD_PRODUCT_DISPLAY];

spec/api/crash-reporter.coffee

@@ -13,7 +13,7 @@ describe 'crash-reporter module', ->
     server = http.createServer (req, res) ->
       form = new formidable.IncomingForm()
       form.parse req, (error, fields, files) ->
-        assert.equal fields['prod'], 'Atom-Shell'
+        assert.equal fields['prod'], 'atom-shell'
         assert.equal fields['ver'], process.versions['atom-shell']
         assert.equal fields['process_type'], 'renderer'
         assert.equal fields['platform'], process.platform