Update gclient solution advisory for WebRTC tests.

chrome/browser/media/webrtc_browsertest_common.cc

Index: chrome/browser/media/webrtc_browsertest_common.cc
diff --git a/chrome/browser/media/webrtc_browsertest_common.cc b/chrome/browser/media/webrtc_browsertest_common.cc
index d67a6996b40fb067270edac1e541f12d6b7a79cf..8d1b307aa9c6fb1e4782a215d4ee6f1b0376bae5 100644
--- a/chrome/browser/media/webrtc_browsertest_common.cc
+++ b/chrome/browser/media/webrtc_browsertest_common.cc
@@ -29,13 +29,16 @@ const base::FilePath::CharType kY4mFileExtension[] = FILE_PATH_LITERAL("y4m");
 
 // This message describes how to modify your .gclient to get the reference
 // video files downloaded for you.
-static const char kAdviseOnGclientSolution[] =
-    "You need to add this solution to your .gclient to run this test:\n"
+const char kAdviseOnGclientSolution[] =
+    "To run this test, you must run download_from_google_storage --config\n"
+    "and follow the instructions (use 'browser' for project id)\n"
+    "You also need to add this solution to your .gclient:\n"
     "{\n"
     "  \"name\"        : \"webrtc.DEPS\",\n"
     "  \"url\"         : \"https://chromium.googlesource.com/chromium/deps/"
     "webrtc/webrtc.DEPS\",\n"
-    "}";
+    "}\n"
+    "and run gclient sync. This will download the required ref files.";
 
 const int kDefaultPollIntervalMsec = 250;