Update to 45.9.0

Changelog:
Security fixes:
#CVE-2017-5433: Use-after-free in SMIL animation functions
#CVE-2017-5435: Use-after-free during transaction processing in the editor
#CVE-2017-5436: Out-of-bounds write with malicious font in Graphite 2
#CVE-2017-5461: Out-of-bounds write in Base64 encoding in NSS
#CVE-2017-5459: Buffer overflow in WebGL
#CVE-2017-5434: Use-after-free during focus handling
#CVE-2017-5432: Use-after-free in text input selection
#CVE-2017-5460: Use-after-free in frame selection
#CVE-2017-5438: Use-after-free in nsAutoPtr during XSLT processing
#CVE-2017-5439: Use-after-free in nsTArray Length() during XSLT processing
#CVE-2017-5440: Use-after-free in txExecutionState destructor during XSLT processing
#CVE-2017-5441: Use-after-free with selection during scroll events
#CVE-2017-5442: Use-after-free during style changes
#CVE-2017-5464: Memory corruption with accessibility and DOM manipulation
#CVE-2017-5443: Out-of-bounds write during BinHex decoding
#CVE-2017-5444: Buffer overflow while parsing application/http-index-format content
#CVE-2017-5446: Out-of-bounds read when HTTP/2 DATA frames are sent with incorrect data
#CVE-2017-5447: Out-of-bounds read during glyph processing
#CVE-2017-5465: Out-of-bounds read in ConvolvePixel
#CVE-2017-5448: Out-of-bounds write in ClearKeyDecryptor
#CVE-2016-10196: Vulnerabilities in Libevent library
#CVE-2017-5469: Potential Buffer overflow in flex-generated code
#CVE-2017-5445: Uninitialized values used while parsing application/http-index-format content
#CVE-2017-5462: DRBG flaw in NSS
#CVE-2017-5429: Memory safety bugs fixed in Firefox 53, Firefox ESR 45.9, and Firefox ESR 52.1

(ryoon)