Use fake audio in RenderProcessHostTest.

This CL moves the command-line switch from
CaptureStreamRenderProcessHostTest to its parent, RenderProcessHostTest.
Some RenderProcessHostTests use audio and are still flaking.

Bug: 986021
Change-Id: Ic1327890183433ef9dd737d7c8d649560e5a981f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107540
Auto-Submit: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751121}

content/browser/renderer_host/render_process_host_browsertest.cc

@@ -186,6 +186,11 @@ class RenderProcessHostTest : public ContentBrowserTest,
   }
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
+#if defined(OS_LINUX)
+    // Due to problems with PulseAudio failing to start, use a fake audio
+    // stream. https://crbug.com/1047655#c70
+    command_line->AppendSwitch(switches::kDisableAudioOutput);
+#endif
     command_line->AppendSwitchASCII(
         switches::kAutoplayPolicy,
         switches::autoplay::kNoUserGestureRequiredPolicy);
@@ -917,11 +922,6 @@ class CaptureStreamRenderProcessHostTest : public RenderProcessHostTest {
   }
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
-#if defined(OS_LINUX)
-    // Due to problems with PulseAudio failing to start, use a fake audio
-    // stream. https://crbug.com/1047655#c70
-    command_line->AppendSwitch(switches::kDisableAudioOutput);
-#endif
     // These flags are necessary to emulate camera input for getUserMedia()
     // tests.
     command_line->AppendSwitch(switches::kUseFakeUIForMediaStream);