Fix mojo and mandoline android build breaks.

Exclude the mandoline target on android for now (no main).
Rename the test targets to avoid naming conflicts...
(android GN targets doesn't seem to respect output_name)
Update the namespace for mojo::util::FilePathToFileURL call.

See initial breakage at http://build.chromium.org/p/chromium.mojo/builders/Chromium%20Mojo%20Android/builds/384

The relevant CLs are:
  https://codereview.chromium.org/1109993002
  https://codereview.chromium.org/1091513005

BUG=466129
TEST=Building mojo and mandoline for android passes.
R=sky@chromium.org,ben@chromium.org

Review URL: https://codereview.chromium.org/1115463002

Cr-Commit-Position: refs/heads/master@{#327361}

mandoline/BUILD.gn

@@ -9,7 +9,7 @@ group("mandoline_all") {
     "//mojo:mojo",
   ]
 
-  if (!is_component_build) {
+  if (!is_android && !is_component_build) {
     deps += [ "//mandoline/app:mandoline" ]
   }
 }

mojo/runner/BUILD.gn

@@ -17,14 +17,14 @@ group("runner") {
 
   deps = [
     ":mojo_runner",
-    ":tests",
-    "//mojo/shell:tests",
+    ":mojo_runner_unittests",
+    "//mojo/shell:mojo_shell_unittests",
   ]
 
   if (is_android) {
     deps += [
       ":mojo_runner_apk",
-      ":tests_apk",
+      ":mojo_runner_unittests_apk",
     ]
   }
 }
@@ -332,9 +332,7 @@ mojom("child_process_bindings") {
   ]
 }
 
-test("tests") {
-  output_name = "mojo_runner_unittests"
-
+test("mojo_runner_unittests") {
   sources = [
     "child_process_host_unittest.cc",
     "data_pipe_peek_unittest.cc",

mojo/runner/shell_test_base_android.cc

@@ -38,7 +38,7 @@ void ShellTestBase::SetUpTestApplications() {
       Java_ShellTestBase_extractMojoApplications(
           env, base::android::GetApplicationContext()));
   shell_context_.url_resolver()->SetMojoBaseURL(
-      FilePathToFileURL(base::FilePath(
+      mojo::util::FilePathToFileURL(base::FilePath(
           base::android::ConvertJavaStringToUTF8(env, service_dir.obj()))));
 }
 

mojo/shell/BUILD.gn

@@ -49,9 +49,7 @@ source_set("shell") {
   ]
 }
 
-test("tests") {
-  output_name = "mojo_shell_unittests"
-
+test("mojo_shell_unittests") {
   sources = [
     "application_manager_unittest.cc",
     "query_util_unittest.cc",