Rename the various shell MojoMains to ShellMain.

shell/android/apk/src/org/chromium/mojo/shell/MojoShellActivity.java

Index: shell/android/apk/src/org/chromium/mojo/shell/MojoShellActivity.java
diff --git a/shell/android/apk/src/org/chromium/mojo/shell/MojoShellActivity.java b/shell/android/apk/src/org/chromium/mojo/shell/MojoShellActivity.java
index 023b929d927024982d240e1583d04a0f6bc52387..a56c43de651efc3659823a18418bb9024ad8061b 100644
--- a/shell/android/apk/src/org/chromium/mojo/shell/MojoShellActivity.java
+++ b/shell/android/apk/src/org/chromium/mojo/shell/MojoShellActivity.java
@@ -32,10 +32,10 @@ public class MojoShellActivity extends Activity {
         // TODO(qsr): We should be passing application context here as required by
         // InitApplicationContext on the native side. Currently we can't, as PlatformViewportAndroid
         // relies on this being the activity context.
-        MojoMain.ensureInitialized(this, getParametersFromIntent(getIntent()));
+        ShellMain.ensureInitialized(this, getParametersFromIntent(getIntent()));
 
-        // TODO(eseidel): MojoMain can fail, but we're ignoring the return.
-        MojoMain.start();
+        // TODO(eseidel): ShellMain can fail, but we're ignoring the return.
+        ShellMain.start();
     }
 
     private static String[] getParametersFromIntent(Intent intent) {