Download a compatible version of chromedriver with chrome

Following the [algorithm described on the official chromedriver website](https://chromedriver.chromium.org/downloads/version-selection) :

> Here are the steps to select the version of ChromeDriver to download:
>
> - First, find out which version of Chrome you are using. Let's say you have Chrome 72.0.3626.81.
> - Take the Chrome version number, remove the last part, and append the result to URL "https://chromedriver.storage.googleapis.com/LATEST_RELEASE_". For example, with Chrome version 72.0.3626.81, you'd get a URL "https://chromedriver.storage.googleapis.com/LATEST_RELEASE_72.0.3626".
> - Use the URL created in the last step to retrieve a small file containing the version of ChromeDriver to use. For example, the above URL will get your a file containing "72.0.3626.69". (The actual number may change in the future, of course.)
> - Use the version number retrieved from the previous step to construct the URL to download ChromeDriver. With version 72.0.3626.69, the URL would be "https://chromedriver.storage.googleapis.com/index.html?path=72.0.3626.69/".

Author: Lctrs

.travis.yml

@@ -134,7 +134,13 @@ install:
   - travis_retry composer update --no-interaction $DEPENDENCIES
 
 before_script:
-  - if [ "$BROWSER_NAME" = "chrome" ]; then mkdir chromedriver; CHROMEDRIVER_VERSION=$(wget -qO- "https://chromedriver.storage.googleapis.com/LATEST_RELEASE"); wget -q -t 3 https://chromedriver.storage.googleapis.com/$CHROMEDRIVER_VERSION/chromedriver_linux64.zip; unzip chromedriver_linux64 -d chromedriver; fi
+  - if [ "$BROWSER_NAME" = "chrome" ]; then
+      mkdir chromedriver;
+      CHROME_VERSION=$(google-chrome --product-version);
+      CHROME_VERSION=${CHROME_VERSION%.*};
+      wget -q -t 3 https://chromedriver.storage.googleapis.com/$(curl -L https://chromedriver.storage.googleapis.com/LATEST_RELEASE_${CHROME_VERSION})/chromedriver_linux64.zip;
+      unzip chromedriver_linux64.zip -d chromedriver;
+    fi
   - if [ "$BROWSER_NAME" = "chrome" ]; then export CHROMEDRIVER_PATH=$PWD/chromedriver/chromedriver; fi
   - if [ "$GECKODRIVER" = "1" ]; then mkdir -p geckodriver; wget -q -t 3 https://github.com/mozilla/geckodriver/releases/download/v0.26.0/geckodriver-v0.26.0-linux64.tar.gz; tar xzf geckodriver-v0.26.0-linux64.tar.gz -C geckodriver; fi
   - sh -e /etc/init.d/xvfb start # TODO: start only when needed (ie. not in headless mode)