Android: Update Android Studio stable version

Stable's gradle plugin has updated to 3.0.1.

TBR=agrieve@chromium.org

Bug: 620034
Change-Id: I91dc19b1ef2dc3215b7219b4cfdc58274ca21050
Reviewed-on: https://chromium-review.googlesource.com/897054Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533780}

build/android/gradle/root.jinja

@@ -14,7 +14,7 @@ buildscript {
 {% if canary %}
         classpath "com.android.tools.build:gradle:3.1.0-alpha08"
 {% else %}
-        classpath "com.android.tools.build:gradle:3.0.0"
+        classpath "com.android.tools.build:gradle:3.0.1"
 {% endif %}
     }
 }