fuchsia: Make test binaries depend on exe_and_shlib_deps

This resolves e.g. base_unittests not being able to find operator new,
string::string(), etc. in Debug (is_component_build=true) builds.

This matches other platforms, but was missed in creating the Fuchsia
test() template.

Bug: 750392
Change-Id: I1a7ba2988e9d991f26d392eeab670f3a100de319
Reviewed-on: https://chromium-review.googlesource.com/596520Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491208}

testing/test.gni

@@ -246,6 +246,7 @@ template("test") {
         data_deps = []
       }
       data_deps += [ ":$_test_runner_target" ]
+      deps += [ "//build/config:exe_and_shlib_deps" ]
     }
   } else if (is_ios) {
     import("//build/config/ios/ios_sdk.gni")