Work around issue on Windows with BuckBuild in IDE tests

Or any system where watchman isn't supported. Turns out
that sometimes the wrong line of output was being
selected to search for the path to the output.

java/client/test/org/openqa/selenium/BuckBuild.java

@@ -98,7 +98,14 @@ private Path findOutput(Path projectRoot) throws IOException {
     }
 
     String[] allLines = commandLine.getStdOut().split(LINE_SEPARATOR.value());
-    String lastLine = allLines[allLines.length -1 ];
+    String lastLine = null;
+    for (String line : allLines) {
+      if (line.startsWith(target)) {
+        lastLine = line;
+        break;
+      }
+    }
+    Preconditions.checkNotNull(lastLine);
 
     List<String> outputs = Splitter.on(' ').limit(2).splitToList(lastLine);
     if (outputs.size() != 2) {
@@ -137,8 +144,7 @@ private void downloadBuckPexIfNecessary(ImmutableList.Builder<String> builder)
     Path projectRoot = InProject.locate("Rakefile").getParentFile().toPath();
     String buckVersion = new String(Files.readAllBytes(projectRoot.resolve(".buckversion"))).trim();
 
-    File rootOfRepo = InProject.locate("Rakefile").getParentFile();
-    Path pex = rootOfRepo.toPath().resolve("buck-out/crazy-fun/" + buckVersion + "/buck.pex");
+    Path pex = projectRoot.resolve("buck-out/crazy-fun/" + buckVersion + "/buck.pex");
 
     String expectedHash = new String(Files.readAllBytes(projectRoot.resolve(".buckhash"))).trim();
     HashCode md5 = Files.exists(pex) ?