Include chrome_elf.dll and ffmpegsumo.dll in Windows isolate for Chromoting tests.

BUG=425176

Review URL: https://codereview.chromium.org/698203005

Cr-Commit-Position: refs/heads/master@{#302735}

testing/chromoting/chromoting_integration_tests.isolate

@@ -49,6 +49,14 @@
         ],
       },
     }],
+    ['OS=="win"', {
+      'variables': {
+        'files': [
+          '<(PRODUCT_DIR)/chrome_elf.dll',
+          '<(PRODUCT_DIR)/ffmpegsumo.dll',
+        ],
+      },
+    }],
     ['OS=="mac" or OS=="win"', {
       'variables': {
         'command': [