[ChromeDriver] Fix chromedriver_py_tests on Mac component build

Add a missing dependency that was causing chromedriver_py_tests to
fail on Mac when is_component_build=true.

Bug: 814818
Change-Id: I923d6e96910255380669d5f02f3bc828feaa3396
Reviewed-on: https://chromium-review.googlesource.com/935287
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538881}

chrome/test/chromedriver/BUILD.gn

@@ -347,6 +347,9 @@ group("chromedriver_py_tests") {
   data_deps = [
     "//chrome/test/chromedriver",
   ]
+  if (is_component_build && is_mac) {
+    data_deps += [ "//chrome:chrome_framework" ]
+  }
 
   if (is_win) {
     # On Windows, the following target produces the final chrome.exe