Revert "Update Android Apps to use gradle"

platform_tools/android/apps/build.gradle

-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-
-buildscript {
-    repositories {
-        jcenter()
-    }
-    dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
-
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
-    }
-}
-
-allprojects {
-    repositories {
-        jcenter()
-    }
-}
-
-def getLocalProperties() {
-    Properties properties = new Properties()
-    File propFile = project.rootProject.file('local.properties')
-    if (propFile.canRead()) {
-        properties.load(propFile.newDataInputStream())
-    }
-    propFile = project.rootProject.file('gradle.properties')
-    if (propFile.canRead()) {
-        properties.load(propFile.newDataInputStream())
-    }
-    return properties
-}
-
-def getSDKPath() {
-    String path = System.getenv("ANDROID_SDK_ROOT")
-    if (path == null) {
-        path = getLocalProperties().getProperty('sdk.dir', null)
-    }
-
-    if (path == null) {
-        throw new GradleScriptException("Android SDK not found! Please set ANDROID_SDK_ROOT to" +
-                                        " your path or define sdk.dir in gradle.properties")
-    }
-    return path
-}
-
-def getPathWithDepotTools() {
-    System.getenv("PATH") + ":" + getLocalProperties().getProperty('depot_tools.dir', null)
-    String path = System.getenv("PATH")
-    if (!path.contains("depot_tools")) {
-        path += ":" + getLocalProperties().getProperty('depot_tools.dir', null)
-    }
-
-    if (!path.contains("depot_tools")) {
-        throw GradleScriptException("Depot Tools not found! Please update your path to include" +
-                                    " depot_tools or define depot_tools.dir in gradle.properties")
-    }
-    return path
-}
-
-def constructBuildCommand(variant, buildTarget) {
-    String cmdLine = "./platform_tools/android/bin/android_ninja $buildTarget"
-    String deviceType = null
-    if (variant.name.startsWith("arm64")) {
-        deviceType = "arm64"
-    } else if (variant.name.startsWith("arm")) {
-        deviceType = "arm_v7_neon"
-    } else if (variant.name.startsWith("x86_64")) {
-        deviceType = "x86_64"
-    } else if (variant.name.startsWith("x86")) {
-        deviceType = "x86"
-    } else if (variant.name.startsWith("mips")) {
-        deviceType = "mips"
-    } else if (variant.name.startsWith("mips64")) {
-        deviceType = "mips64"
-    }
-
-    if (deviceType != null) {
-        cmdLine += " -d " + deviceType
-    }
-
-    if (variant.name.endsWith("Release")) {
-        cmdLine += " --release"
-    }
-    return cmdLine
-}