fix: correct Chrome path on Windows

Checks for Chrome in the default location on windows taking into account
32 and 64 bit machines.  Falls back to the version in the user's
profile.

Closes #2

index.js

@@ -1,3 +1,6 @@
+var os = require('os'),
+    fs = require('fs');
+
 var ChromeBrowser = function(baseBrowserDecorator, args) {
   baseBrowserDecorator(this);
 
@@ -22,7 +25,7 @@ ChromeBrowser.prototype = {
   DEFAULT_CMD: {
     linux: 'google-chrome',
     darwin: '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome',
-    win32: process.env.LOCALAPPDATA + '\\Google\\Chrome\\Application\\chrome.exe'
+    win32: windowsChromePath('\\Google\\Chrome\\Application\\chrome.exe')
   },
   ENV_CMD: 'CHROME_BIN'
 };
@@ -46,13 +49,26 @@ ChromeCanaryBrowser.prototype = {
   DEFAULT_CMD: {
     linux: 'google-chrome-canary',
     darwin: '/Applications/Google Chrome Canary.app/Contents/MacOS/Google Chrome Canary',
-    win32: process.env.LOCALAPPDATA + '\\Google\\Chrome SxS\\Application\\chrome.exe'
+    win32: windowsChromePath('\\Google\\Chrome SxS\\Application\\chrome.exe')
   },
   ENV_CMD: 'CHROME_CANARY_BIN'
 };
 
 ChromeCanaryBrowser.$inject = ['baseBrowserDecorator', 'args'];
 
+var windowsChromePath = function(chromeExe) {
+	if (os.platform() !== 'win32') {
+		return '';
+  }
+
+	var globalInstall = os.arch() === 'x64' ? process.env['ProgramFiles(x86)'] : process.env.ProgramFiles;
+
+	if (fs.existsSync(globalInstall + chromeExe)) {
+		return globalInstall + chromeExe;
+  }
+
+	return process.env.LOCALAPPDATA + chromeExe;
+}
 
 // PUBLISH DI MODULE
 module.exports = {