Bug 1527796 - Part 4. Convert file separator to slash. r=nalexander

The file separator of Windows is backslash, not slash.  So we have to convert
it to slash if necessary.

Differential Revision: https://phabricator.services.mozilla.com/D20453

--HG--
extra : rebase_source : 68db0c1fc2870a605aa3d9ed34163ba20bbe6f90

mobile/android/app/build.gradle

@@ -32,7 +32,7 @@ android {
         testApplicationId 'org.mozilla.roboexample.test'
         testInstrumentationRunner 'org.mozilla.gecko.FennecInstrumentationTestRunner'
         // Used by Robolectric based tests; see TestRunner.
-        buildConfigField 'String', 'BUILD_DIR', "\"${project.buildDir}\""
+        buildConfigField 'String', 'BUILD_DIR', "\"${project.buildDir}\"".tr(File.separator, "/")
 
         vectorDrawables.useSupportLibrary = true
         multiDexEnabled true

mobile/android/gradle/with_gecko_binaries.gradle

@@ -91,7 +91,7 @@ ext.configureLibraryVariantWithJNIWrappers = { variant, module ->
     // JNI wrappers is the moz.build system, which always builds geckoview to
     // consume from Fennec, so that dependency likely adds less to the build time.
     def jarTask = tasks["transformClassesAndResourcesWithPrepareIntermediateJarsFor${variant.name.capitalize()}"]
-    def bundleJar = jarTask.outputs.files.find({ it.absolutePath.contains('/classes.jar') })
+    def bundleJar = jarTask.outputs.files.find({ it.name == 'classes.jar' })
 
     def annotationProcessorsJarTask = project(':annotations').jar
 
@@ -140,7 +140,7 @@ ext.configureLibraryVariantWithJNIWrappers = { variant, module ->
 
 ext.configureApplicationVariantWithJNIWrappers = { variant, module ->
     def jarTask = tasks["bundleAppClasses${variant.name.capitalize()}"]
-    def bundleJar = jarTask.outputs.files.find({ it.absolutePath.contains('/classes.jar') })
+    def bundleJar = jarTask.outputs.files.find({ it.name == 'classes.jar' })
 
     def annotationProcessorsJarTask = project(':annotations').jar